21430492 has 12 divisors (see below), whose sum is σ = 37557520. Its totient is φ = 10699776.

The previous prime is 21430481. The next prime is 21430529. The reversal of 21430492 is 29403412.

It is a congruent 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, 408 + ... + 6559.

Almost surely, 2^21430492 is an apocalyptic number.

It is an amenable number.

21430492 is a deficient number, since it is larger than the sum of its proper divisors (16127028).

21430492 is a wasteful number, since it uses less digits than its factorization.

21430492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7740 (or 7738 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 21430492 is about 4629.3079396385. The cubic root of 21430492 is about 277.7649100291.

The spelling of 21430492 in words is "twenty-one million, four hundred thirty thousand, four hundred ninety-two".