21923696178 has 12 divisors (see below), whose sum is σ = 47501341758. Its totient is φ = 7307898720.

The previous prime is 21923696141. The next prime is 21923696203. The reversal of 21923696178 is 87169632912.

21923696178 is a `hidden beast` number, since 2 + 19 + 2 + 3 + 6 + 9 + 617 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12240545769 + 9683150409 = 110637^2 + 98403^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 608991543 + ... + 608991578.

Almost surely, 2^21923696178 is an apocalyptic number.

21923696178 is an abundant number, since it is smaller than the sum of its proper divisors (25577645580).

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

21923696178 is a wasteful number, since it uses less digits than its factorization.

21923696178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217983129 (or 1217983126 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The spelling of 21923696178 in words is "twenty-one billion, nine hundred twenty-three million, six hundred ninety-six thousand, one hundred seventy-eight".