'Twenty first' in the Bible

On the first [day], on the fourteenth day of the month, in the evening, you will eat unleavened bread until the evening of the twenty-first day of the month.

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

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

In the seventh [month] on the twenty-first day, the word of Yahweh {came through} Haggai the prophet, saying,