21036324 has 24 divisors (see below), whose sum is σ = 49235200. Its totient is φ = 6990624.

The previous prime is 21036311. The next prime is 21036341. The reversal of 21036324 is 42363012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21036324.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1677 + ... + 6699.

Almost surely, 2^21036324 is an apocalyptic number.

It is an amenable number.

21036324 is an abundant number, since it is smaller than the sum of its proper divisors (28198876).

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

21036324 is a wasteful number, since it uses less digits than its factorization.

21036324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5379 (or 5377 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 21036324 is about 4586.5372559263. The cubic root of 21036324 is about 276.0513976953.

Adding to 21036324 its reverse (42363012), we get a palindrome (63399336).

The spelling of 21036324 in words is "twenty-one million, thirty-six thousand, three hundred twenty-four".