22521904 has 10 divisors (see below), whose sum is σ = 43636220. Its totient is φ = 11260944.

The previous prime is 22521901. The next prime is 22521931. The reversal of 22521904 is 40912522.

It is not an unprimeable number, because it can be changed into a prime (22521901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 703794 + ... + 703825.

It is an arithmetic number, because the mean of its divisors is an integer number (4363622).

Almost surely, 2^22521904 is an apocalyptic number.

It is an amenable number.

22521904 is a deficient number, since it is larger than the sum of its proper divisors (21114316).

22521904 is a wasteful number, since it uses less digits than its factorization.

22521904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407627 (or 1407621 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 22521904 is about 4745.7248129237. The cubic root of 22521904 is about 282.4023898553.

It can be divided in two parts, 225 and 21904, that multiplied together give a square (4928400 = 2220²).

The spelling of 22521904 in words is "twenty-two million, five hundred twenty-one thousand, nine hundred four".