LSJ
ενός, twenty-one, UPZ 81 ii 14 (ii BC).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
TBESG
twenty-one (MT)
Translators Brief lexicon of Extended Strongs for Greek based on Abbot-Smith, A Manual Greek Lexicon of the New Testament (1922) (=AS), with corrections and adapted by Tyndale Scholars