22221988 has 6 divisors (see below), whose sum is σ = 38888486. Its totient is φ = 11110992.

The previous prime is 22221977. The next prime is 22222049. The reversal of 22221988 is 88912222.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 22202944 + 19044 = 4712^2 + 138^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2777745 + ... + 2777752.

Almost surely, 2^22221988 is an apocalyptic number.

It is an amenable number.

22221988 is a deficient number, since it is larger than the sum of its proper divisors (16666498).

22221988 is a wasteful number, since it uses less digits than its factorization.

22221988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5555501 (or 5555499 counting only the distinct ones).

The product of its digits is 9216, while the sum is 34.

The square root of 22221988 is about 4714.0203648266. The cubic root of 22221988 is about 281.1432340104.

The spelling of 22221988 in words is "twenty-two million, two hundred twenty-one thousand, nine hundred eighty-eight".