222221122100 has 18 divisors (see below), whose sum is σ = 482219835174. Its totient is φ = 88888448800.

The previous prime is 222221122099. The next prime is 222221122103. The reversal of 222221122100 is 1221122222.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 240684196 + 221980437904 = 15514^2 + 471148^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222221122103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1111105511 + ... + 1111105710.

It is an arithmetic number, because the mean of its divisors is an integer number (26789990843).

Almost surely, 2^222221122100 is an apocalyptic number.

222221122100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

222221122100 is an abundant number, since it is smaller than the sum of its proper divisors (259998713074).

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

222221122100 is a wasteful number, since it uses less digits than its factorization.

222221122100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222211235 (or 2222211228 counting only the distinct ones).

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

Adding to 222221122100 its reverse (1221122222), we get a palindrome (223442244322).

The spelling of 222221122100 in words is "two hundred twenty-two billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred".