21430892 has 12 divisors (see below), whose sum is σ = 42861840. Its totient is φ = 9184656.

The previous prime is 21430861. The next prime is 21430909. The reversal of 21430892 is 29803412.

21430892 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382667 + ... + 382722.

It is an arithmetic number, because the mean of its divisors is an integer number (3571820).

Almost surely, 2^21430892 is an apocalyptic number.

It is an amenable number.

21430892 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21430892 is a wasteful number, since it uses less digits than its factorization.

21430892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765400 (or 765398 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 21430892 is about 4629.3511424389. The cubic root of 21430892 is about 277.7666381785.

It can be divided in two parts, 21430 and 892, that added together give a palindrome (22322).

The spelling of 21430892 in words is "twenty-one million, four hundred thirty thousand, eight hundred ninety-two".