21904058 has 16 divisors (see below), whose sum is σ = 37952064. Its totient is φ = 9370560.

The previous prime is 21904031. The next prime is 21904061. The reversal of 21904058 is 85040912.

It is a self number, because there is not a number n which added to its sum of digits gives 21904058.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28910 + ... + 29657.

It is an arithmetic number, because the mean of its divisors is an integer number (2372004).

Almost surely, 2^21904058 is an apocalyptic number.

21904058 is a deficient number, since it is larger than the sum of its proper divisors (16048006).

21904058 is a wasteful number, since it uses less digits than its factorization.

21904058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58597.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 21904058 is about 4680.1771334000. The cubic root of 21904058 is about 279.7960163974.

The spelling of 21904058 in words is "twenty-one million, nine hundred four thousand, fifty-eight".