21000

21000 is an integer, a natural number that follows 20999 and precedes 21001. It is an even number, divisible by 2. In terms of prime factorization, 21000 can be broken down into its prime factors: 2^3 * 3 * 5^3 * 7. This means it is composed of three factors of 2, one factor of 3, three factors of 5, and one factor of 7.

The number 21000 is also a composite number, as it has more than two distinct positive divisors. Its divisors include 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, 140, 150, 168, 175, 200, 210, 280, 300, 336, 350, 420, 500, 525, 600, 700, 750, 840, 1000, 1050, 1200, 1400, 1500, 1750, 2100, 2500, 2625, 3000, 3500, 4200, 5250, 7000, 10500, and 21000.

The number can be represented in scientific notation as 2.1 x 10^4. In Roman numerals, 21000 would be represented as XXI, with a bar over the last I indicating multiplication by 1000. This is achieved by combining X (10) and I (1), where the bar signifies the higher value.