Twenty one thousand
21000 is an even number.
21000 is a Harshad number, which means it is divisible by the sum of its digits (2 + 1 + 0 + 0 + 0 = 3, and 21000 is divisible by 3).
In binary, 21000 is represented as 101001000001000.
In hex, 21000 is represented as 5208.
Prime factorization of 21000: 23 * 3 * 53 * 7.
Factors of 21000 are: 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 25, 28, 30, 35, 40, 42, 50, 56, 60, 70, 75, 84, 100, 105, 120, 125, 140, 150, 168, 175, 200, 210, 250, 280, 300, 350, 375, 420, 500, 525, 600, 700, 750, 840, 875, 1000, 1050, 1400, 1500, 1750, 2100, 2625, 3000, 3500, 4200, 5250, 7000, 10500, 21000.