21198872 has 16 divisors (see below), whose sum is σ = 39803400. Its totient is φ = 10584640.

The previous prime is 21198869. The next prime is 21198907. The reversal of 21198872 is 27889112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6404 + ... + 9132.

Almost surely, 2^21198872 is an apocalyptic number.

It is an amenable number.

21198872 is a deficient number, since it is larger than the sum of its proper divisors (18604528).

21198872 is a wasteful number, since it uses less digits than its factorization.

21198872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3706 (or 3702 counting only the distinct ones).

The product of its digits is 16128, while the sum is 38.

The square root of 21198872 is about 4604.2232786866. The cubic root of 21198872 is about 276.7605919707.

The spelling of 21198872 in words is "twenty-one million, one hundred ninety-eight thousand, eight hundred seventy-two".