21323944 has 16 divisors (see below), whose sum is σ = 41721120. Its totient is φ = 10198320.

The previous prime is 21323941. The next prime is 21323959. The reversal of 21323944 is 44932312.

It is not an unprimeable number, because it can be changed into a prime (21323941) 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, 57762 + ... + 58129.

It is an arithmetic number, because the mean of its divisors is an integer number (2607570).

Almost surely, 2^21323944 is an apocalyptic number.

It is an amenable number.

21323944 is a deficient number, since it is larger than the sum of its proper divisors (20397176).

21323944 is a wasteful number, since it uses less digits than its factorization.

21323944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115920 (or 115916 counting only the distinct ones).

The product of its digits is 5184, while the sum is 28.

The square root of 21323944 is about 4617.7856165049. The cubic root of 21323944 is about 277.3038150186.

The spelling of 21323944 in words is "twenty-one million, three hundred twenty-three thousand, nine hundred forty-four".