21983668 has 36 divisors (see below), whose sum is σ = 44911776. Its totient is φ = 9223200.

The previous prime is 21983641. The next prime is 21983671. The reversal of 21983668 is 86638912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104083 + ... + 104293.

Almost surely, 2^21983668 is an apocalyptic number.

21983668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21983668 is an abundant number, since it is smaller than the sum of its proper divisors (22928108).

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

21983668 is a wasteful number, since it uses less digits than its factorization.

21983668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344 (or 281 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 21983668 is about 4688.6744395405. The cubic root of 21983668 is about 280.1345781636.

The spelling of 21983668 in words is "twenty-one million, nine hundred eighty-three thousand, six hundred sixty-eight".