21957679088 has 10 divisors (see below), whose sum is σ = 42543003264. Its totient is φ = 10978839536.

The previous prime is 21957679049. The next prime is 21957679103. The reversal of 21957679088 is 88097675912.

It is a self number, because there is not a number n which added to its sum of digits gives 21957679088.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 686177456 + ... + 686177487.

Almost surely, 2^21957679088 is an apocalyptic number.

It is an amenable number.

21957679088 is a deficient number, since it is larger than the sum of its proper divisors (20585324176).

21957679088 is a wasteful number, since it uses less digits than its factorization.

21957679088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372354951 (or 1372354945 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 62.

The spelling of 21957679088 in words is "twenty-one billion, nine hundred fifty-seven million, six hundred seventy-nine thousand, eighty-eight".