-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 FT/4Y8i+b4MQTm9RrCUndtAvOCGUWyD8Y2JUeYyCgJ/PCbdkU2QHVdKusvbW+m85
 aMn0U1CXlIhV8HEMB/w1/w==

<SEC-DOCUMENT>0000931755-09-000002.txt : 20090508
<SEC-HEADER>0000931755-09-000002.hdr.sgml : 20090508
<ACCEPTANCE-DATETIME>20090508155234
ACCESSION NUMBER:		0000931755-09-000002
CONFORMED SUBMISSION TYPE:	D/A
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
FILED AS OF DATE:		20090508
DATE AS OF CHANGE:		20090508
EFFECTIVENESS DATE:		20090508

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AEI INCOME & GROWTH FUND XXI LTD PARTNERSHIP
		CENTRAL INDEX KEY:			0000931755
		STANDARD INDUSTRIAL CLASSIFICATION:	REAL ESTATE [6500]
		IRS NUMBER:				411789725
		STATE OF INCORPORATION:			MN
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-47801
		FILM NUMBER:		09810562

	BUSINESS ADDRESS:	
		STREET 1:		30 EAST 7TH ST SUITE 1300
		CITY:			ST PAUL
		STATE:			MN
		ZIP:			55101
		BUSINESS PHONE:		6512277333

	MAIL ADDRESS:	
		STREET 1:		30 EAST 7TH ST SUITE 1300
		CITY:			ST PAUL
		STATE:			MN
		ZIP:			55101
</SEC-HEADER>
<DOCUMENT>
<TYPE>D/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0301</schemaVersion>

    <submissionType>D/A</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0000931755</cik>
        <entityName>AEI INCOME &amp; GROWTH FUND XXI LTD PARTNERSHIP</entityName>
        <issuerAddress>
            <street1>30 EAST 7TH ST SUITE 1300</street1>
            <street2></street2>
            <city>ST PAUL</city>
            <stateOrCountry>MN</stateOrCountry>
            <zipCode>55101</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>6512277333</issuerPhoneNumber>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <jurisdictionOfInc>MN</jurisdictionOfInc>
        <entityType>Limited Partnership</entityType>
        <yearOfInc>
            <overFiveYears>true</overFiveYears>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>KinderCare Learning Center</firstName>
                <middleName></middleName>
                <lastName>Ballwin Missouri</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>30 E 7th Street Suite 1300</street1>
                <street2></street2>
                <city>St. Paul</city>
                <stateOrCountry>MN</stateOrCountry>
                <zipCode>55101</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Promoter</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Tenant in Common offering by the Issuer</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Robert</firstName>
                <middleName>P</middleName>
                <lastName>Johnson</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>30 E 7th Street Suite 1300</street1>
                <street2></street2>
                <city>St. Paul</city>
                <stateOrCountry>MN</stateOrCountry>
                <zipCode>55101</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Patrick</firstName>
                <middleName>W</middleName>
                <lastName>Keene</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>30 E 7th Street Suite 1300</street1>
                <street2></street2>
                <city>St. Paul</city>
                <stateOrCountry>MN</stateOrCountry>
                <zipCode>55101</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Commercial</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Not Applicable</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>true</isAmendment>
                <previousAccessionNumber>0000931755-09-000001</previousAccessionNumber>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2008-12-23</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isTenantInCommonType>true</isTenantInCommonType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>5000</minimumInvestmentAccepted>
        <salesCompensationList>
            <recipient>
                <recipientName>FINRA member broker-dealers</recipientName>
                <recipientCRDNumber>None</recipientCRDNumber>
                <associatedBDName>FINRA member broker-dealers that may execute selling agreements</associatedBDName>
                <associatedBDCRDNumber>None</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>30 E 7th Street Suite 1300</street1>
                    <street2></street2>
                    <city>St. Paul</city>
                    <stateOrCountry>MN</stateOrCountry>
                    <zipCode>55101</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <value>All States</value>
                </statesOfSolicitationList>
            </recipient>
        </salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>3100000</totalOfferingAmount>
            <totalAmountSold>197000</totalAmountSold>
            <totalRemaining>2903000</totalRemaining>
            <clarificationOfResponse>Co-tenancy interests in real property</clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>0</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>155000</dollarAmount>
                <isEstimate>true</isEstimate>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>2945000</dollarAmount>
                <isEstimate>true</isEstimate>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>AEI INCOME &amp; GROWTH FUND XXI LTD PARTNERSHIP</issuerName>
                <signatureName>RONA NEWTSON</signatureName>
                <nameOfSigner>AEI INCOME &amp; GROWTH FUND XXI LP BY AEI FUND MANAGEMENT XXI INC ITS GP</nameOfSigner>
                <signatureTitle>RONA NEWTSON AUTH SIGNATORY FOR ROBERT P JOHNSON PRESIDENT</signatureTitle>
                <signatureDate>2009-05-07</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----