22521572 has 12 divisors (see below), whose sum is σ = 39456060. Its totient is φ = 11248416.

The previous prime is 22521563. The next prime is 22521599. The reversal of 22521572 is 27512522.

It can be written as a sum of positive squares in 2 ways, for example, as 10797796 + 11723776 = 3286^2 + 3424^2 .

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, 1898 + ... + 6974.

It is an arithmetic number, because the mean of its divisors is an integer number (3288005).

Almost surely, 2^22521572 is an apocalyptic number.

It is an amenable number.

22521572 is a deficient number, since it is larger than the sum of its proper divisors (16934488).

22521572 is a wasteful number, since it uses less digits than its factorization.

22521572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6190 (or 6188 counting only the distinct ones).

The product of its digits is 2800, while the sum is 26.

The square root of 22521572 is about 4745.6898339441. The cubic root of 22521572 is about 282.4010021980.

The spelling of 22521572 in words is "twenty-two million, five hundred twenty-one thousand, five hundred seventy-two".