21430392 has 16 divisors (see below), whose sum is σ = 53576040. Its totient is φ = 7143456.

The previous prime is 21430379. The next prime is 21430403. The reversal of 21430392 is 29303412.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 892933 = 21430392 / (2 + 1 + 4 + 3 + 0 + 3 + 9 + 2).

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, 446443 + ... + 446490.

Almost surely, 2^21430392 is an apocalyptic number.

It is an amenable number.

21430392 is an abundant number, since it is smaller than the sum of its proper divisors (32145648).

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

21430392 is a wasteful number, since it uses less digits than its factorization.

21430392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892942 (or 892938 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 21430392 is about 4629.2971388754. The cubic root of 21430392 is about 277.7644779884.

The spelling of 21430392 in words is "twenty-one million, four hundred thirty thousand, three hundred ninety-two".