21.

German

German numbers ^(edit)

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Cardinal: einundzwanzig     Ordinal: einundzwanzigste     Sequence adverb: einundzwanzigstens     Ordinal abbreviation: 21.     Adverbial: einundzwanzigmal     Adverbial abbreviation: 21-mal     Multiplier: einundzwanzigfach     Multiplier abbreviation: 21-fach     Fractional: Einundzwanzigstel     Polygon: Einundzwanzigeck     Polygon abbreviation: 21-Eck     Polygonal adjective: einundzwanzigeckig     Polygonal adjective abbreviation: 21-eckig
German Wikipedia article on 21

Adjective

21. (indeclinable)

1. (ordinal number) abbreviation of einundzwanzigste 21st, twenty-first