21576968 has 32 divisors (see below), whose sum is σ = 46421760. Its totient is φ = 9210240.

The previous prime is 21576959. The next prime is 21576979. The reversal of 21576968 is 86967512.

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, 16913 + ... + 18143.

It is an arithmetic number, because the mean of its divisors is an integer number (1450680).

Almost surely, 2^21576968 is an apocalyptic number.

21576968 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21576968 is an abundant number, since it is smaller than the sum of its proper divisors (24844792).

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

21576968 is a wasteful number, since it uses less digits than its factorization.

21576968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557 (or 1553 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The square root of 21576968 is about 4645.1015058877. The cubic root of 21576968 is about 278.3963086334.

The spelling of 21576968 in words is "twenty-one million, five hundred seventy-six thousand, nine hundred sixty-eight".