21199672 has 16 divisors (see below), whose sum is σ = 42807240. Its totient is φ = 9784416.

The previous prime is 21199643. The next prime is 21199681. The reversal of 21199672 is 27699112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101818 + ... + 102025.

Almost surely, 2^21199672 is an apocalyptic number.

It is an amenable number.

21199672 is an abundant number, since it is smaller than the sum of its proper divisors (21607568).

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

21199672 is a wasteful number, since it uses less digits than its factorization.

21199672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203862 (or 203858 counting only the distinct ones).

The product of its digits is 13608, while the sum is 37.

The square root of 21199672 is about 4604.3101546269. The cubic root of 21199672 is about 276.7640733774.

The spelling of 21199672 in words is "twenty-one million, one hundred ninety-nine thousand, six hundred seventy-two".