21625474 has 48 divisors (see below), whose sum is σ = 38630592. Its totient is φ = 9003456.

The previous prime is 21625469. The next prime is 21625489. The reversal of 21625474 is 47452612.

It is a super-2 number, since 2×21625474² = 935322251449352, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 502897 + ... + 502939.

It is an arithmetic number, because the mean of its divisors is an integer number (804804).

Almost surely, 2^21625474 is an apocalyptic number.

21625474 is a deficient number, since it is larger than the sum of its proper divisors (17005118).

21625474 is a wasteful number, since it uses less digits than its factorization.

21625474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 110 counting only the distinct ones).

The product of its digits is 13440, while the sum is 31.

The square root of 21625474 is about 4650.3197739510. The cubic root of 21625474 is about 278.6047683337.

The spelling of 21625474 in words is "twenty-one million, six hundred twenty-five thousand, four hundred seventy-four".