21635262451231 has 32 divisors (see below), whose sum is σ = 26976541697280. Its totient is φ = 17199913943520.

The previous prime is 21635262451183. The next prime is 21635262451277. The reversal of 21635262451231 is 13215426253612.

It is not a de Polignac number, because 21635262451231 - 2⁹ = 21635262450719 is a prime.

It is a super-2 number, since 2×21635262451231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21635262451031) 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, 32575885 + ... + 33233398.

It is an arithmetic number, because the mean of its divisors is an integer number (843016928040).

Almost surely, 2^{21635262451231} is an apocalyptic number.

21635262451231 is a deficient number, since it is larger than the sum of its proper divisors (5341279246049).

21635262451231 is a wasteful number, since it uses less digits than its factorization.

21635262451231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65809348 (or 65809326 counting only the distinct ones).

The product of its digits is 518400, while the sum is 43.

The spelling of 21635262451231 in words is "twenty-one trillion, six hundred thirty-five billion, two hundred sixty-two million, four hundred fifty-one thousand, two hundred thirty-one".