'Twenty one' in the Bible

Zedekiah was twenty-one years old when he began to reign; and he reigned eleven years in Jerusalem; and his mother's name was Hamutal, daughter of Jeremiah of Libnah.

Zedekiah was twenty-one years old when he began to reign; and he reigned eleven years in Jerusalem.

The children of Ramah and Geba, six hundred and twenty-one.

The men of Ramah and Geba, six hundred and twenty-one.

The children of Lod, Hadid, and Ono, seven hundred and twenty-one.

Zedekiah was twenty-one years old when he began to reign; and he reigned eleven years in Jerusalem; and his mother's name was Hamutal, daughter of Jeremiah of Libnah.

But the prince of the kingdom of Persia was withstanding me for twenty-one days; then behold, Michael, one of the chief princes, came to help me, for I had been left there with the kings of Persia.

and said, “What are you willing to give me if I hand Jesus over to you?” And they weighed out thirty pieces of silver.