21 (number)
Appearance
Twenty-one is a number. It comes between twenty and twenty-two, and is an odd number. It is also the 8th prime number, after 3, 5, 7, 11, 13, 17, and 19.
Twenty-one is a number. It comes between twenty and twenty-two, and is an odd number. It is also the 8th prime number, after 3, 5, 7, 11, 13, 17, and 19.