21966968 has 16 divisors (see below), whose sum is σ = 41364000. Its totient is φ = 10936576.

The previous prime is 21966961. The next prime is 21967019. The reversal of 21966968 is 86966912.

It is a super-2 number, since 2×21966968² = 965095366226048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21966961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3833 + ... + 7656.

It is an arithmetic number, because the mean of its divisors is an integer number (2585250).

Almost surely, 2^21966968 is an apocalyptic number.

It is an amenable number.

21966968 is a deficient number, since it is larger than the sum of its proper divisors (19397032).

21966968 is a wasteful number, since it uses less digits than its factorization.

21966968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11734 (or 11730 counting only the distinct ones).

The product of its digits is 279936, while the sum is 47.

The square root of 21966968 is about 4686.8932140598. The cubic root of 21966968 is about 280.0636249970.

The spelling of 21966968 in words is "twenty-one million, nine hundred sixty-six thousand, nine hundred sixty-eight".