22221021100 has 18 divisors (see below), whose sum is σ = 48219616004. Its totient is φ = 8888408400.

The previous prime is 22221021089. The next prime is 22221021139. The reversal of 22221021100 is 112012222.

It is a happy 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, 111105006 + ... + 111105205.

Almost surely, 2^22221021100 is an apocalyptic number.

22221021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22221021100 is an abundant number, since it is smaller than the sum of its proper divisors (25998594904).

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

22221021100 is a wasteful number, since it uses less digits than its factorization.

22221021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222210225 (or 222210218 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22221021100 its reverse (112012222), we get a palindrome (22333033322).

The spelling of 22221021100 in words is "twenty-two billion, two hundred twenty-one million, twenty-one thousand, one hundred".