21804304 has 20 divisors (see below), whose sum is σ = 42346000. Its totient is φ = 10876320.

The previous prime is 21804283. The next prime is 21804329. The reversal of 21804304 is 40340812.

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, 6619 + ... + 9349.

It is an arithmetic number, because the mean of its divisors is an integer number (2117300).

Almost surely, 2^21804304 is an apocalyptic number.

It is an amenable number.

21804304 is a deficient number, since it is larger than the sum of its proper divisors (20541696).

21804304 is a wasteful number, since it uses less digits than its factorization.

21804304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238 (or 3232 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 21804304 is about 4669.5078969844. The cubic root of 21804304 is about 279.3706271973.

The spelling of 21804304 in words is "twenty-one million, eight hundred four thousand, three hundred four".