21886968 has 16 divisors (see below), whose sum is σ = 54717480. Its totient is φ = 7295648.

The previous prime is 21886927. The next prime is 21886979. The reversal of 21886968 is 86968812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455955 + ... + 456002.

Almost surely, 2^21886968 is an apocalyptic number.

It is an amenable number.

21886968 is an abundant number, since it is smaller than the sum of its proper divisors (32830512).

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

21886968 is a wasteful number, since it uses less digits than its factorization.

21886968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911966 (or 911962 counting only the distinct ones).

The product of its digits is 331776, while the sum is 48.

The square root of 21886968 is about 4678.3509915354. The cubic root of 21886968 is about 279.7232299141.

The spelling of 21886968 in words is "twenty-one million, eight hundred eighty-six thousand, nine hundred sixty-eight".