21796363872 has 120 divisors (see below), whose sum is σ = 66170567232. Its totient is φ = 7031059200.

The previous prime is 21796363861. The next prime is 21796363879. The reversal of 21796363872 is 27836369712.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21796363879) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 55279 + ... + 215982.

Almost surely, 2^21796363872 is an apocalyptic number.

It is an amenable number.

21796363872 is an abundant number, since it is smaller than the sum of its proper divisors (44374203360).

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

21796363872 is a wasteful number, since it uses less digits than its factorization.

21796363872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271314 (or 271297 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The spelling of 21796363872 in words is "twenty-one billion, seven hundred ninety-six million, three hundred sixty-three thousand, eight hundred seventy-two".