21873996 has 48 divisors (see below), whose sum is σ = 56973280. Its totient is φ = 7257600.

The previous prime is 21873977. The next prime is 21874009. The reversal of 21873996 is 69937812.

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, 36096 + ... + 36696.

Almost surely, 2^21873996 is an apocalyptic number.

It is an amenable number.

21873996 is an abundant number, since it is smaller than the sum of its proper divisors (35099284).

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

21873996 is a wasteful number, since it uses less digits than its factorization.

21873996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951 (or 943 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 21873996 is about 4676.9644001211. The cubic root of 21873996 is about 279.6679567360.

The spelling of 21873996 in words is "twenty-one million, eight hundred seventy-three thousand, nine hundred ninety-six".