21867902884 has 9 divisors (see below), whose sum is σ = 38269347627. Its totient is φ = 10933803564.

The previous prime is 21867902843. The next prime is 21867902891. The reversal of 21867902884 is 48820976812.

It is a happy number.

The square root of 21867902884 is 147878.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 258787 + ... + 332725.

Almost surely, 2^21867902884 is an apocalyptic number.

21867902884 is the 147878-th square number.

It is an amenable number.

21867902884 is a deficient number, since it is larger than the sum of its proper divisors (16401444743).

21867902884 is an frugal number, since it uses more digits than its factorization.

21867902884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147882 (or 73941 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 55.

The spelling of 21867902884 in words is "twenty-one billion, eight hundred sixty-seven million, nine hundred two thousand, eight hundred eighty-four".