22521004 has 72 divisors (see below), whose sum is σ = 47667200. Its totient is φ = 9266400.

The previous prime is 22520999. The next prime is 22521041. The reversal of 22521004 is 40012522.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 285037 + ... + 285115.

Almost surely, 2^22521004 is an apocalyptic number.

It is an amenable number.

22521004 is an abundant number, since it is smaller than the sum of its proper divisors (25146196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22521004 is a wasteful number, since it uses less digits than its factorization.

22521004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 22521004 is about 4745.6299897906. The cubic root of 22521004 is about 282.3986281021.

Adding to 22521004 its reverse (40012522), we get a palindrome (62533526).

The spelling of 22521004 in words is "twenty-two million, five hundred twenty-one thousand, four".