21957968744 has 16 divisors (see below), whose sum is σ = 42590888100. Its totient is φ = 10600398592.

The previous prime is 21957968737. The next prime is 21957968783. The reversal of 21957968744 is 44786975912.

It can be written as a sum of positive squares in 2 ways, for example, as 20721602500 + 1236366244 = 143950^2 + 35162^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47322977 + ... + 47323440.

Almost surely, 2^21957968744 is an apocalyptic number.

It is an amenable number.

21957968744 is a deficient number, since it is larger than the sum of its proper divisors (20632919356).

21957968744 is a wasteful number, since it uses less digits than its factorization.

21957968744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94646452 (or 94646448 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 62.

The spelling of 21957968744 in words is "twenty-one billion, nine hundred fifty-seven million, nine hundred sixty-eight thousand, seven hundred forty-four".