22221112220 has 12 divisors (see below), whose sum is σ = 46664335704. Its totient is φ = 8888444880.

The previous prime is 22221112157. The next prime is 22221112231. The reversal of 22221112220 is 2221112222.

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 3 ways as a sum of consecutive naturals, for example, 555527786 + ... + 555527825.

It is an arithmetic number, because the mean of its divisors is an integer number (3888694642).

Almost surely, 2^22221112220 is an apocalyptic number.

22221112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22221112220 is an abundant number, since it is smaller than the sum of its proper divisors (24443223484).

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

22221112220 is a wasteful number, since it uses less digits than its factorization.

22221112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111055620 (or 1111055618 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22221112220 its reverse (2221112222), we get a palindrome (24442224442).

The spelling of 22221112220 in words is "twenty-two billion, two hundred twenty-one million, one hundred twelve thousand, two hundred twenty".