22221684 has 18 divisors (see below), whose sum is σ = 56171570. Its totient is φ = 7407216.

The previous prime is 22221649. The next prime is 22221691. The reversal of 22221684 is 48612222.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18301284 + 3920400 = 4278^2 + 1980^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 308599 + ... + 308670.

Almost surely, 2^22221684 is an apocalyptic number.

It is an amenable number.

22221684 is an abundant number, since it is smaller than the sum of its proper divisors (33949886).

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

22221684 is a wasteful number, since it uses less digits than its factorization.

22221684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617279 (or 617274 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 22221684 is about 4713.9881204772. The cubic root of 22221684 is about 281.1419519779.

The spelling of 22221684 in words is "twenty-two million, two hundred twenty-one thousand, six hundred eighty-four".