21537377796 has 48 divisors (see below), whose sum is σ = 55216869120. Its totient is φ = 6479519520.

The previous prime is 21537377773. The next prime is 21537377803. The reversal of 21537377796 is 69777373512.

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, 568566 + ... + 605261.

It is an arithmetic number, because the mean of its divisors is an integer number (1150351440).

Almost surely, 2^21537377796 is an apocalyptic number.

It is an amenable number.

21537377796 is an abundant number, since it is smaller than the sum of its proper divisors (33679491324).

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

21537377796 is a wasteful number, since it uses less digits than its factorization.

21537377796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173984 (or 1173982 counting only the distinct ones).

The product of its digits is 11668860, while the sum is 57.

The spelling of 21537377796 in words is "twenty-one billion, five hundred thirty-seven million, three hundred seventy-seven thousand, seven hundred ninety-six".