21373324 has 24 divisors (see below), whose sum is σ = 43167488. Its totient is φ = 9069840.

The previous prime is 21373277. The next prime is 21373327. The reversal of 21373324 is 42337312.

It is not an unprimeable number, because it can be changed into a prime (21373327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 822 + ... + 6589.

Almost surely, 2^21373324 is an apocalyptic number.

It is an amenable number.

21373324 is an abundant number, since it is smaller than the sum of its proper divisors (21794164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21373324 is a wasteful number, since it uses less digits than its factorization.

21373324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7525 (or 7523 counting only the distinct ones).

The product of its digits is 3024, while the sum is 25.

The square root of 21373324 is about 4623.1292432724. The cubic root of 21373324 is about 277.5177014383.

It can be divided in two parts, 213 and 73324, that added together give a palindrome (73537).

The spelling of 21373324 in words is "twenty-one million, three hundred seventy-three thousand, three hundred twenty-four".