'Twenty first' in the Bible

The first month and the fourteenth day of the month at even, ye shall eat sweet bread unto the twenty-first day of the month at even again.

The twenty-first to Jachin. The twenty-second to Gamul.

The twenty-first to Hothir with his sons and brethren, twelve persons.

The twenty first day of the seventh month, came the word of the LORD by the Prophet Haggai, saying,