21812

21812 is a positive integer that sits in the middle of four-digit numbers, following 21811 and preceding 21813. It is an even number.

In prime factorization terms, 21812 = 2^2 × 7 × 19 × 41. This makes the number composite, with a total of 24 divisors. The sum of its positive divisors is 47040, which implies that 21812 is not a perfect number and not a prime.

Representations of 21812 in different bases include binary, hexadecimal, and octal. In binary, 21812 is 101010100110100. In hexadecimal, it is 0x5534. In octal, it is 52464. These base representations can be useful for computer science applications or low-level numerical work.

Mathematically, 21812 is notable mainly as a concrete example of a composite number with a relatively rich factorization. It does not correspond to a well-known constant, widely cited sequence, or named mathematical object. As a standalone number, its significance is primarily in its factorization properties and its representations in various numeral bases.

See also: lists of natural numbers, properties of composite numbers, base-representation conversions.