AEI INCOME & GROWTH FUND XXI LTD PARTNERSHIP

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Annual report pursuant to Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Annual report pursuant to Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Annual report pursuant to Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d) (amendment)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Annual report pursuant to Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

2.01,9.01

General form for quarterly reports under Section 13 or 15(d)

Annual report pursuant to Section 13 or 15(d)

2.01,9.01

2.01,9.01

2.01,9.01

2.01,9.01

5.07

Definitive Proxy Statement

2.01,9.01

Preliminary Proxy Statement

2.01,9.01

2.01,9.01

8.01

2.01,9.01

2.01,9.01

Completion of Acquisition or Disposition of Assets

5.07

Definitive Proxy Statement

No description available

Preliminary Proxy Statement

2.01,9.01

06

2.01,9.01

06

06

06

06

06

06

06

06

2.01,9.01

FILED AS OF DATE: 20080512

2.01,9.01

Letter from the SEC

Letter from the SEC

Correspondence with the SEC

Correspondence with the SEC

Letter from the SEC

Completion of Acquisition or Disposition of Assets

06

06

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Completion of Acquisition or Disposition of Assets

06

06

06

06

06

04

05

No description available

KEENE PATRICK W