21916953396 has 72 divisors (see below), whose sum is σ = 59682823200. Its totient is φ = 6741417024.

The previous prime is 21916953371. The next prime is 21916953449. The reversal of 21916953396 is 69335961912.

21916953396 is a `hidden beast` number, since 2 + 1 + 9 + 16 + 9 + 533 + 96 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1867555 + ... + 1879253.

It is an arithmetic number, because the mean of its divisors is an integer number (828928100).

Almost surely, 2^21916953396 is an apocalyptic number.

21916953396 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21916953396 is an abundant number, since it is smaller than the sum of its proper divisors (37765869804).

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

21916953396 is a wasteful number, since it uses less digits than its factorization.

21916953396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15725 (or 15720 counting only the distinct ones).

The product of its digits is 2361960, while the sum is 54.

The spelling of 21916953396 in words is "twenty-one billion, nine hundred sixteen million, nine hundred fifty-three thousand, three hundred ninety-six".