'Twenty first' in the Bible

In the first [month], on the fourteenth day of the month at evening, ye shall eat unleavened bread, until the twenty-first day of the month at evening.

the twenty-first to Jachin, the twenty-second to Gamul,

for the twenty-first to Hothir, his sons and his brothers, twelve;

In the seventh [month], in the twenty-first [day] of the month, the word of LORD came by Haggai the prophet, saying,