21500

21500 is an integer in the decimal numeral system. It is even and composite. It can be expressed as 215 × 100 and has a prime factorization of 2^2 × 5^3 × 43. This makes the number have 24 positive divisors.

The number ends with two zeros, so it is divisible by 100 as well as by 4, 5, and 25. Its divisors include 1, 2, 4, 5, 10, 20, 25, 43, 86, 172, 215, 430, 860, 1075, 2150, 4300, 5375, 10750, and 21500, among others.

Digit sum is 2+1+5+0+0 = 8, so the number is not divisible by 3 or 9. Its approximate square root is sqrt(21500) ≈ 146.6.

In decimal notation, the value is 21,500; in scientific notation it is 2.15 × 10^4.

There are no widely standardized meanings attached to 21500 beyond its arithmetic properties. It may appear as a numeric value in various counting, coding, or cataloging contexts where a specific integer is required. See also numbers adjacent to it, such as 21499 and 21501, for related numerical context.