21173324 has 12 divisors (see below), whose sum is σ = 38055024. Its totient is φ = 10300464.

The previous prime is 21173311. The next prime is 21173333. The reversal of 21173324 is 42337112.

It is a self number, because there is not a number n which added to its sum of digits gives 21173324.

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, 71384 + ... + 71679.

It is an arithmetic number, because the mean of its divisors is an integer number (3171252).

Almost surely, 2^21173324 is an apocalyptic number.

It is an amenable number.

21173324 is a deficient number, since it is larger than the sum of its proper divisors (16881700).

21173324 is a wasteful number, since it uses less digits than its factorization.

21173324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143104 (or 143102 counting only the distinct ones).

The product of its digits is 1008, while the sum is 23.

The square root of 21173324 is about 4601.4480329566. The cubic root of 21173324 is about 276.6493671543.

The spelling of 21173324 in words is "twenty-one million, one hundred seventy-three thousand, three hundred twenty-four".