21976268 has 24 divisors (see below), whose sum is σ = 39961152. Its totient is φ = 10566864.

The previous prime is 21976249. The next prime is 21976271. The reversal of 21976268 is 86267912.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10571 + ... + 12477.

It is an arithmetic number, because the mean of its divisors is an integer number (1665048).

Almost surely, 2^21976268 is an apocalyptic number.

It is an amenable number.

21976268 is a deficient number, since it is larger than the sum of its proper divisors (17984884).

21976268 is a wasteful number, since it uses less digits than its factorization.

21976268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021 (or 2019 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The square root of 21976268 is about 4687.8852375032. The cubic root of 21976268 is about 280.1031422734.

The spelling of 21976268 in words is "twenty-one million, nine hundred seventy-six thousand, two hundred sixty-eight".