21373392 has 20 divisors (see below), whose sum is σ = 55214720. Its totient is φ = 7124448.

The previous prime is 21373379. The next prime is 21373393. The reversal of 21373392 is 29337312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21373393) 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, 222592 + ... + 222687.

It is an arithmetic number, because the mean of its divisors is an integer number (2760736).

Almost surely, 2^21373392 is an apocalyptic number.

It is an amenable number.

21373392 is an abundant number, since it is smaller than the sum of its proper divisors (33841328).

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

21373392 is a wasteful number, since it uses less digits than its factorization.

21373392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445290 (or 445284 counting only the distinct ones).

The product of its digits is 6804, while the sum is 30.

The square root of 21373392 is about 4623.1365975926. The cubic root of 21373392 is about 277.5179957488.

The spelling of 21373392 in words is "twenty-one million, three hundred seventy-three thousand, three hundred ninety-two".