21159924 has 48 divisors (see below), whose sum is σ = 50788416. Its totient is φ = 6854400.

The previous prime is 21159923. The next prime is 21159953. The reversal of 21159924 is 42995112.

21159924 is nontrivially palindromic in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21159923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100179 + ... + 100389.

It is an arithmetic number, because the mean of its divisors is an integer number (1058092).

Almost surely, 2^21159924 is an apocalyptic number.

It is an amenable number.

21159924 is an abundant number, since it is smaller than the sum of its proper divisors (29628492).

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

21159924 is a wasteful number, since it uses less digits than its factorization.

21159924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416 (or 414 counting only the distinct ones).

The product of its digits is 6480, while the sum is 33.

The square root of 21159924 is about 4599.9917391230. The cubic root of 21159924 is about 276.5909936425.

The spelling of 21159924 in words is "twenty-one million, one hundred fifty-nine thousand, nine hundred twenty-four".