21956826931 has 32 divisors (see below), whose sum is σ = 24373440000. Its totient is φ = 19655129088.

The previous prime is 21956826917. The next prime is 21956826937. The reversal of 21956826931 is 13962865912.

It is not a de Polignac number, because 21956826931 - 2²⁵ = 21923272499 is a prime.

It is a super-2 number, since 2×21956826931² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21956826937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35471140 + ... + 35471758.

It is an arithmetic number, because the mean of its divisors is an integer number (761670000).

Almost surely, 2^21956826931 is an apocalyptic number.

21956826931 is a deficient number, since it is larger than the sum of its proper divisors (2416613069).

21956826931 is a wasteful number, since it uses less digits than its factorization.

21956826931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243.

The product of its digits is 1399680, while the sum is 52.

The spelling of 21956826931 in words is "twenty-one billion, nine hundred fifty-six million, eight hundred twenty-six thousand, nine hundred thirty-one".