21252911504 has 20 divisors (see below), whose sum is σ = 44920926960. Its totient is φ = 9660414240.

The previous prime is 21252911503. The next prime is 21252911507. The reversal of 21252911504 is 40511925212.

It is not an unprimeable number, because it can be changed into a prime (21252911503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60377414 + ... + 60377765.

It is an arithmetic number, because the mean of its divisors is an integer number (2246046348).

Almost surely, 2^21252911504 is an apocalyptic number.

It is an amenable number.

21252911504 is an abundant number, since it is smaller than the sum of its proper divisors (23668015456).

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

21252911504 is a wasteful number, since it uses less digits than its factorization.

21252911504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120755198 (or 120755192 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The spelling of 21252911504 in words is "twenty-one billion, two hundred fifty-two million, nine hundred eleven thousand, five hundred four".