21983268 has 12 divisors (see below), whose sum is σ = 51294320. Its totient is φ = 7327752.

The previous prime is 21983237. The next prime is 21983281. The reversal of 21983268 is 86238912.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

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, 915958 + ... + 915981.

Almost surely, 2^21983268 is an apocalyptic number.

It is an amenable number.

21983268 is an abundant number, since it is smaller than the sum of its proper divisors (29311052).

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

21983268 is a wasteful number, since it uses less digits than its factorization.

21983268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831946 (or 1831944 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 21983268 is about 4688.6317833671. The cubic root of 21983268 is about 280.1328791067.

The spelling of 21983268 in words is "twenty-one million, nine hundred eighty-three thousand, two hundred sixty-eight".