21987558300 has 36 divisors (see below), whose sum is σ = 63617336216. Its totient is φ = 5863348800.

The previous prime is 21987558253. The next prime is 21987558337. The reversal of 21987558300 is 385578912.

It is a self number, because there is not a number n which added to its sum of digits gives 21987558300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36645631 + ... + 36646230.

Almost surely, 2^21987558300 is an apocalyptic number.

21987558300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21987558300 is an abundant number, since it is smaller than the sum of its proper divisors (41629777916).

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

21987558300 is a wasteful number, since it uses less digits than its factorization.

21987558300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73291878 (or 73291871 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 48.

The spelling of 21987558300 in words is "twenty-one billion, nine hundred eighty-seven million, five hundred fifty-eight thousand, three hundred".