21628324 has 12 divisors (see below), whose sum is σ = 38020864. Its totient is φ = 10765224.

The previous prime is 21628283. The next prime is 21628339. The reversal of 21628324 is 42382612.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21628292 and 21628301.

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, 11232 + ... + 13015.

Almost surely, 2^21628324 is an apocalyptic number.

It is an amenable number.

21628324 is a deficient number, since it is larger than the sum of its proper divisors (16392540).

21628324 is a wasteful number, since it uses less digits than its factorization.

21628324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24474 (or 24472 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 21628324 is about 4650.6261943958. The cubic root of 21628324 is about 278.6170068124.

It can be divided in two parts, 21628 and 324, that added together give a cube (21952 = 28³).

The spelling of 21628324 in words is "twenty-one million, six hundred twenty-eight thousand, three hundred twenty-four".