21975376168 has 32 divisors (see below), whose sum is σ = 42650533800. Its totient is φ = 10602360832.

The previous prime is 21975376141. The next prime is 21975376183. The reversal of 21975376168 is 86167357912.

It can be written as a sum of positive squares in 4 ways, for example, as 20511395524 + 1463980644 = 143218^2 + 38262^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365796 + ... + 421612.

Almost surely, 2^21975376168 is an apocalyptic number.

It is an amenable number.

21975376168 is a deficient number, since it is larger than the sum of its proper divisors (20675157632).

21975376168 is a wasteful number, since it uses less digits than its factorization.

21975376168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57549 (or 57545 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 55.

The spelling of 21975376168 in words is "twenty-one billion, nine hundred seventy-five million, three hundred seventy-six thousand, one hundred sixty-eight".