21373120 has 28 divisors (see below), whose sum is σ = 50895504. Its totient is φ = 8549120.

The previous prime is 21373111. The next prime is 21373123. The reversal of 21373120 is 2137312.

It is not an unprimeable number, because it can be changed into a prime (21373123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33076 + ... + 33715.

Almost surely, 2^21373120 is an apocalyptic number.

21373120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21373120 is an abundant number, since it is smaller than the sum of its proper divisors (29522384).

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

21373120 is an equidigital number, since it uses as much as digits as its factorization.

21373120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66808 (or 66798 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 21373120 is about 4623.1071802414. The cubic root of 21373120 is about 277.5168185029.

The spelling of 21373120 in words is "twenty-one million, three hundred seventy-three thousand, one hundred twenty".