22021788 has 24 divisors (see below), whose sum is σ = 53156880. Its totient is φ = 7087360.

The previous prime is 22021739. The next prime is 22021799. The reversal of 22021788 is 88712022.

It is a happy number.

It is a congruent number.

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, 31293 + ... + 31988.

It is an arithmetic number, because the mean of its divisors is an integer number (2214870).

Almost surely, 2^22021788 is an apocalyptic number.

It is an amenable number.

22021788 is an abundant number, since it is smaller than the sum of its proper divisors (31135092).

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

22021788 is a wasteful number, since it uses less digits than its factorization.

22021788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63317 (or 63315 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 22021788 is about 4692.7377936552. The cubic root of 22021788 is about 280.2964038077.

The spelling of 22021788 in words is "twenty-two million, twenty-one thousand, seven hundred eighty-eight".