21814372 has 12 divisors (see below), whose sum is σ = 38389680. Its totient is φ = 10845896.

The previous prime is 21814369. The next prime is 21814379. The reversal of 21814372 is 27341812.

It is a self number, because there is not a number n which added to its sum of digits gives 21814372.

It is not an unprimeable number, because it can be changed into a prime (21814379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14518 + ... + 15949.

It is an arithmetic number, because the mean of its divisors is an integer number (3199140).

Almost surely, 2^21814372 is an apocalyptic number.

It is an amenable number.

21814372 is a deficient number, since it is larger than the sum of its proper divisors (16575308).

21814372 is a wasteful number, since it uses less digits than its factorization.

21814372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30650 (or 30648 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 21814372 is about 4670.5858304928. The cubic root of 21814372 is about 279.4136197898.

The spelling of 21814372 in words is "twenty-one million, eight hundred fourteen thousand, three hundred seventy-two".