| 21 (LP, Album, Stereo) | XL Recordings | XLLP 520 | Europe | 2011 | |
| 21 (CD, Album, Limited Edition) | XL Recordings | XLCD 520 E | UK & Europe | 2011 | |
| 21 (CD, Album) | XL Recordings | XLCD 520 | Europe | 2011 | |
| 21 (CD, Album, Limited Edition, CD, Single) | High Note Records, XL Recordings, High Note Records, XL Recordings | HN826CD, HN826CDX | Taiwan | 2011 | |
| 21 (CD, Album, Limited Edition, Amazon.co.uk Edition) | XL Recordings, XL Recordings | XLCD520AMZ, XLCD 520 | UK | 2011 | |
℗ & © 2011 XL Recordings Ltd.
Design – - Adele (3) , - Phil Lee (5)
Lacquer Cut By – - KR (3)
Mastered By – - Tom Coyne
Photography By – - Lauren Dukoff
Vocals – - Adele (3)
Phonographic Copyright XL Recordings Ltd
Copyright XL Recordings Ltd
Published By Universal Songs Of Polygram International, Inc
Published By EMI Blackwood Music Inc
Published By EMI Music Publishing Ltd
Published By Write 2 Live
Published By Kobalt Songs Music Publishing, Inc
Published By Chrysalis Music
Published By Sugar Lake Music
Published By Chrysalis Songs
Published By Sony/ATV Songs LLC
Published By Sony/ATV Music Publishing UK Ltd
Published By Firehouse Cat Music
Published By Universal MusicMGB Songs
Recorded At ShangriLa, Malibu, CA
Recorded At Eastcote Studios
Recorded At Sphere Studios
Recorded At MyAudiotonic Studios
Recorded At Angel Studios
Recorded At Serenity Sound
Recorded At Air Studios
Recorded At Metropolis Studios
Recorded At Harmony Studios
Mixed At Punkerpad West
Mastered At Sterling Sound
Lacquer Cut at Optimal Media GmbH