222222111100 has 72 divisors (see below), whose sum is σ = 526284815616. Its totient is φ = 80773560000.

The previous prime is 222222111031. The next prime is 222222111193. The reversal of 222222111100 is 1111222222.

It is a happy number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2610205 + ... + 2693995.

It is an arithmetic number, because the mean of its divisors is an integer number (7309511328).

Almost surely, 2^222222111100 is an apocalyptic number.

222222111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222222111100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263142407808).

222222111100 is an abundant number, since it is smaller than the sum of its proper divisors (304062704516).

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

222222111100 is a wasteful number, since it uses less digits than its factorization.

222222111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86227 (or 86220 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 222222111100 its reverse (1111222222), we get a palindrome (223333333322).

The spelling of 222222111100 in words is "two hundred twenty-two billion, two hundred twenty-two million, one hundred eleven thousand, one hundred".