21866980884 has 72 divisors (see below), whose sum is σ = 59387670720. Its totient is φ = 6244084224.

The previous prime is 21866980879. The next prime is 21866980897. The reversal of 21866980884 is 48808966812.

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, 1100889 + ... + 1120575.

It is an arithmetic number, because the mean of its divisors is an integer number (824828760).

Almost surely, 2^21866980884 is an apocalyptic number.

It is an amenable number.

21866980884 is an abundant number, since it is smaller than the sum of its proper divisors (37520689836).

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

21866980884 is a wasteful number, since it uses less digits than its factorization.

21866980884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21597 (or 21588 counting only the distinct ones).

The product of its (nonzero) digits is 10616832, while the sum is 60.

The spelling of 21866980884 in words is "twenty-one billion, eight hundred sixty-six million, nine hundred eighty thousand, eight hundred eighty-four".