21957376 has 36 divisors (see below), whose sum is σ = 50094352. Its totient is φ = 9409536.

The previous prime is 21957373. The next prime is 21957409. The reversal of 21957376 is 67375912.

It is not an unprimeable number, because it can be changed into a prime (21957373) 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, 4335 + ... + 7918.

Almost surely, 2^21957376 is an apocalyptic number.

It is an amenable number.

21957376 is an abundant number, since it is smaller than the sum of its proper divisors (28136976).

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

21957376 is an equidigital number, since it uses as much as digits as its factorization.

21957376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12276 (or 12262 counting only the distinct ones).

The product of its digits is 79380, while the sum is 40.

The square root of 21957376 is about 4685.8698232025. The cubic root of 21957376 is about 280.0228552772.

The spelling of 21957376 in words is "twenty-one million, nine hundred fifty-seven thousand, three hundred seventy-six".