Twenty one thousand nine hundred ninety
21990 is an even number.
In binary, 21990 is represented as 101010111100110.
In hex, 21990 is represented as 55e6.
Prime factorization of 21990: 2 * 3 * 5 * 733.
Factors of 21990 are: 1, 2, 3, 5, 6, 10, 15, 30, 733, 1466, 2199, 3665, 4398, 7330, 10995, 21990.