21631023525657 has 32 divisors (see below), whose sum is σ = 37365330795520. Its totient is φ = 10809256403520.

The previous prime is 21631023525647. The next prime is 21631023525719. The reversal of 21631023525657 is 75652532013612.

It is not a de Polignac number, because 21631023525657 - 2⁶ = 21631023525593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21631023525647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2085113719 + ... + 2085124092.

It is an arithmetic number, because the mean of its divisors is an integer number (1167666587360).

Almost surely, 2^{21631023525657} is an apocalyptic number.

It is an amenable number.

21631023525657 is a deficient number, since it is larger than the sum of its proper divisors (15734307269863).

21631023525657 is a wasteful number, since it uses less digits than its factorization.

21631023525657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4170237853.

The product of its (nonzero) digits is 2268000, while the sum is 48.

The spelling of 21631023525657 in words is "twenty-one trillion, six hundred thirty-one billion, twenty-three million, five hundred twenty-five thousand, six hundred fifty-seven".