21239324 has 12 divisors (see below), whose sum is σ = 39355344. Its totient is φ = 9994944.

The previous prime is 21239303. The next prime is 21239329. The reversal of 21239324 is 42393212.

It is a super-2 number, since 2×21239324² = 902217767953952, which contains 22 as substring.

It is a hoax number, since the sum of its digits (26) 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 = 21239293 and 21239302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21239329) 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, 156104 + ... + 156239.

It is an arithmetic number, because the mean of its divisors is an integer number (3279612).

Almost surely, 2^21239324 is an apocalyptic number.

It is an amenable number.

21239324 is a deficient number, since it is larger than the sum of its proper divisors (18116020).

21239324 is a wasteful number, since it uses less digits than its factorization.

21239324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312364 (or 312362 counting only the distinct ones).

The product of its digits is 2592, while the sum is 26.

The square root of 21239324 is about 4608.6141083844. The cubic root of 21239324 is about 276.9365196624.

The spelling of 21239324 in words is "twenty-one million, two hundred thirty-nine thousand, three hundred twenty-four".