22121868 has 12 divisors (see below), whose sum is σ = 51617720. Its totient is φ = 7373952.

The previous prime is 22121863. The next prime is 22121887. The reversal of 22121868 is 86812122.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (22121861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 921733 + ... + 921756.

Almost surely, 2^22121868 is an apocalyptic number.

It is an amenable number.

22121868 is an abundant number, since it is smaller than the sum of its proper divisors (29495852).

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

22121868 is a wasteful number, since it uses less digits than its factorization.

22121868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843496 (or 1843494 counting only the distinct ones).

The product of its digits is 3072, while the sum is 30.

The square root of 22121868 is about 4703.3889909298. The cubic root of 22121868 is about 280.7203729546.

The spelling of 22121868 in words is "twenty-two million, one hundred twenty-one thousand, eight hundred sixty-eight".