21886768 has 20 divisors (see below), whose sum is σ = 42919128. Its totient is φ = 10810880.

The previous prime is 21886763. The next prime is 21886771. The reversal of 21886768 is 86768812.

It is a super-2 number, since 2×21886768² = 958061226971648, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21886763) 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, 6913 + ... + 9568.

Almost surely, 2^21886768 is an apocalyptic number.

It is an amenable number.

21886768 is a deficient number, since it is larger than the sum of its proper divisors (21032360).

21886768 is a wasteful number, since it uses less digits than its factorization.

21886768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16572 (or 16566 counting only the distinct ones).

The product of its digits is 258048, while the sum is 46.

The square root of 21886768 is about 4678.3296164336. The cubic root of 21886768 is about 279.7223778878.

The spelling of 21886768 in words is "twenty-one million, eight hundred eighty-six thousand, seven hundred sixty-eight".