Back Ҳ. ҟ. 21 Abkhazian 21 v.C. Afrikaans 21 ق م Arabic 21 ق م ARZ 21 e.C. AST E.ə. 21 Azerbaijani 21 v. Kr. BAR 21 да н.э. Byelorussian 21 да н. э. BE-X-OLD 21 г. пр.н.е. Bulgarian
| Anyos: 24 aC 23 aC 22 aC - 21 aC - 20 aC 19 aC 18 aC |
| Decenios: Anyos 30 aC - Anyos 20 aC - Anyos 10 aC |
| Sieglos: Sieglo II aC - Sieglo I aC - Sieglo I |