21337672 has 32 divisors (see below), whose sum is σ = 41771520. Its totient is φ = 10206720.

The previous prime is 21337643. The next prime is 21337717. The reversal of 21337672 is 27673312.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23613 + ... + 24499.

It is an arithmetic number, because the mean of its divisors is an integer number (1305360).

Almost surely, 2^21337672 is an apocalyptic number.

It is an amenable number.

21337672 is a deficient number, since it is larger than the sum of its proper divisors (20433848).

21337672 is a wasteful number, since it uses less digits than its factorization.

21337672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021 (or 1017 counting only the distinct ones).

The product of its digits is 10584, while the sum is 31.

The square root of 21337672 is about 4619.2718040834. The cubic root of 21337672 is about 277.3633101124.

The spelling of 21337672 in words is "twenty-one million, three hundred thirty-seven thousand, six hundred seventy-two".