21725664178904 has 64 divisors (see below), whose sum is σ = 49032471897600. Its totient is φ = 8816047776000.

The previous prime is 21725664178877. The next prime is 21725664178921. The reversal of 21725664178904 is 40987146652712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3752492 + ... + 7585019.

It is an arithmetic number, because the mean of its divisors is an integer number (766132373400).

Almost surely, 2^{21725664178904} is an apocalyptic number.

It is an amenable number.

21725664178904 is an abundant number, since it is smaller than the sum of its proper divisors (27306807718696).

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

21725664178904 is a wasteful number, since it uses less digits than its factorization.

21725664178904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11339344 (or 11339340 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 62.

The spelling of 21725664178904 in words is "twenty-one trillion, seven hundred twenty-five billion, six hundred sixty-four million, one hundred seventy-eight thousand, nine hundred four".