21935872 has 36 divisors (see below), whose sum is σ = 50045296. Its totient is φ = 9400320.

The previous prime is 21935869. The next prime is 21935909. The reversal of 21935872 is 27853912.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 4329 + ... + 7912.

Almost surely, 2^21935872 is an apocalyptic number.

It is an amenable number.

21935872 is an abundant number, since it is smaller than the sum of its proper divisors (28109424).

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

21935872 is an equidigital number, since it uses as much as digits as its factorization.

21935872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12264 (or 12250 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The square root of 21935872 is about 4683.5747031514. The cubic root of 21935872 is about 279.9314117716.

The spelling of 21935872 in words is "twenty-one million, nine hundred thirty-five thousand, eight hundred seventy-two".