21866837000 has 64 divisors (see below), whose sum is σ = 51190542000. Its totient is φ = 8742950400.

The previous prime is 21866836991. The next prime is 21866837017. The reversal of 21866837000 is 73866812.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 406344964 + 21460492036 = 20158^2 + 146494^2 .

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, 4010276 + ... + 4015724.

Almost surely, 2^21866837000 is an apocalyptic number.

21866837000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21866837000 is an abundant number, since it is smaller than the sum of its proper divisors (29323705000).

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

21866837000 is a wasteful number, since it uses less digits than its factorization.

21866837000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9483 (or 9469 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The spelling of 21866837000 in words is "twenty-one billion, eight hundred sixty-six million, eight hundred thirty-seven thousand".