21976368 has 40 divisors (see below), whose sum is σ = 56977008. Its totient is φ = 7299072.

The previous prime is 21976351. The next prime is 21976387. The reversal of 21976368 is 86367912.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16296 + ... + 17592.

Almost surely, 2^21976368 is an apocalyptic number.

It is an amenable number.

21976368 is an abundant number, since it is smaller than the sum of its proper divisors (35000640).

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

21976368 is a wasteful number, since it uses less digits than its factorization.

21976368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661 (or 1655 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 21976368 is about 4687.8959032811. The cubic root of 21976368 is about 280.1035671298.

The spelling of 21976368 in words is "twenty-one million, nine hundred seventy-six thousand, three hundred sixty-eight".