'Twenty one' in the Bible

Zedekiah was twenty-one years old when he became king, and he reigned for eleven years in Jerusalem. His mother’s name was Hamutal daughter of Jeremiah of Libnah.

Zedekiah was twenty-one years old when he became king, and he reigned for eleven years in Jerusalem.

Zedekiah was twenty-one years old when he became king, and he reigned eleven years in Jerusalem; and his mother’s name was Hamutal the daughter of Jeremiah of Libnah.

But the prince of the kingdom of Persia was standing in opposition to me for twenty-one days. Then, behold, Michael, one of the chief [of the celestial] 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.