21326775631 has 12 divisors (see below), whose sum is σ = 24812074008. Its totient is φ = 18277606032.

The previous prime is 21326775583. The next prime is 21326775641. The reversal of 21326775631 is 13657762312.

It is not a de Polignac number, because 21326775631 - 2²³ = 21318387023 is a prime.

It is a super-2 number, since 2×21326775631² (a number of 21 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 (21326775641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 395940 + ... + 446566.

It is an arithmetic number, because the mean of its divisors is an integer number (2067672834).

Almost surely, 2^21326775631 is an apocalyptic number.

21326775631 is a deficient number, since it is larger than the sum of its proper divisors (3485298377).

21326775631 is an equidigital number, since it uses as much as digits as its factorization.

21326775631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59238 (or 59231 counting only the distinct ones).

The product of its digits is 317520, while the sum is 43.

The spelling of 21326775631 in words is "twenty-one billion, three hundred twenty-six million, seven hundred seventy-five thousand, six hundred thirty-one".