21420

21420 is a natural number that follows 21419 and precedes 21421. In mathematics, it is a composite integer with the prime factorization 2^2 × 3^2 × 5 × 7 × 17. This factorization implies it has 72 positive divisors. The digit sum is 9, so 21420 is divisible by 9 and by 3; it is also divisible by 4, 5, 7, and 17, among many other combinations of its prime factors. As a result, 21420 is divisible by 18, 20, 36, and 180, with straightforward quotients such as 21420/20 = 1071 and 21420/180 = 119. It is also a Harshad number in base 10, since it is divisible by the sum of its digits (21420 ÷ 9 = 2380).

In other contexts, 21420 commonly appears as a five-digit numeral used in identifiers such as catalog numbers, model numbers, batch codes, or other alphanumeric systems across various industries. Its meaning is thus context-dependent and not tied to a single widely recognized reference. Like many five-digit numbers, its significance emerges from the domain in which it is applied, rather than from intrinsic properties beyond its arithmetic structure.

See also: nearby integers 21419 and 21421; general lists of natural numbers and factorization properties.