21162688392 has 64 divisors (see below), whose sum is σ = 54161110080. Its totient is φ = 6887123712.

The previous prime is 21162688373. The next prime is 21162688409. The reversal of 21162688392 is 29388626112.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4287558 + ... + 4292490.

It is an arithmetic number, because the mean of its divisors is an integer number (846267345).

Almost surely, 2^21162688392 is an apocalyptic number.

It is an amenable number.

21162688392 is an abundant number, since it is smaller than the sum of its proper divisors (32998421688).

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

21162688392 is a wasteful number, since it uses less digits than its factorization.

21162688392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9142 (or 9138 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The spelling of 21162688392 in words is "twenty-one billion, one hundred sixty-two million, six hundred eighty-eight thousand, three hundred ninety-two".