22921866 has 80 divisors (see below), whose sum is σ = 59067360. Its totient is φ = 6570720.

The previous prime is 22921859. The next prime is 22921867. The reversal of 22921866 is 66812922.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 22921866.

It is not an unprimeable number, because it can be changed into a prime (22921867) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 33520 + ... + 34196.

It is an arithmetic number, because the mean of its divisors is an integer number (738342).

Almost surely, 2^22921866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22921866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29533680).

22921866 is an abundant number, since it is smaller than the sum of its proper divisors (36145494).

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

22921866 is a wasteful number, since it uses less digits than its factorization.

22921866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 712 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 22921866 is about 4787.6785606388. The cubic root of 22921866 is about 284.0642997305.

The spelling of 22921866 in words is "twenty-two million, nine hundred twenty-one thousand, eight hundred sixty-six".