21674872 has 8 divisors (see below), whose sum is σ = 40640400. Its totient is φ = 10837432.

The previous prime is 21674857. The next prime is 21674899. The reversal of 21674872 is 27847612.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1354672 + ... + 1354687.

It is an arithmetic number, because the mean of its divisors is an integer number (5080050).

Almost surely, 2^21674872 is an apocalyptic number.

It is an amenable number.

21674872 is a deficient number, since it is larger than the sum of its proper divisors (18965528).

21674872 is a wasteful number, since it uses less digits than its factorization.

21674872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2709365 (or 2709361 counting only the distinct ones).

The product of its digits is 37632, while the sum is 37.

The square root of 21674872 is about 4655.6279920114. The cubic root of 21674872 is about 278.8167413770.

The spelling of 21674872 in words is "twenty-one million, six hundred seventy-four thousand, eight hundred seventy-two".