21956378232 has 32 divisors (see below), whose sum is σ = 54894873600. Its totient is φ = 7318269024.

The previous prime is 21956378219. The next prime is 21956378233. The reversal of 21956378232 is 23287365912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21956378233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 462633 + ... + 507879.

It is an arithmetic number, because the mean of its divisors is an integer number (1715464800).

Almost surely, 2^21956378232 is an apocalyptic number.

It is an amenable number.

21956378232 is an abundant number, since it is smaller than the sum of its proper divisors (32938495368).

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

21956378232 is a wasteful number, since it uses less digits than its factorization.

21956378232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65475 (or 65471 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 48.

The spelling of 21956378232 in words is "twenty-one billion, nine hundred fifty-six million, three hundred seventy-eight thousand, two hundred thirty-two".