21523272924 has 24 divisors (see below), whose sum is σ = 51072174720. Its totient is φ = 7052823664.

The previous prime is 21523272913. The next prime is 21523272949. The reversal of 21523272924 is 42927232512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15199344 + ... + 15200759.

It is an arithmetic number, because the mean of its divisors is an integer number (2128007280).

Almost surely, 2^21523272924 is an apocalyptic number.

It is an amenable number.

21523272924 is an abundant number, since it is smaller than the sum of its proper divisors (29548901796).

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

21523272924 is a wasteful number, since it uses less digits than its factorization.

21523272924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30400169 (or 30400167 counting only the distinct ones).

The product of its digits is 120960, while the sum is 39.

The spelling of 21523272924 in words is "twenty-one billion, five hundred twenty-three million, two hundred seventy-two thousand, nine hundred twenty-four".