111112221220 has 288 divisors, whose sum is σ = 329402755584. Its totient is φ = 30577029120.

The previous prime is 111112221193. The next prime is 111112221271. The reversal of 111112221220 is 22122211111.

It is a junction number, because it is equal to n+sod(n) for n = 111112221194 and 111112221203.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5054092 + ... + 5076028.

It is an arithmetic number, because the mean of its divisors is an integer number (1143759568).

Almost surely, 2^111112221220 is an apocalyptic number.

111112221220 is a gapful number since it is divisible by the number (10) 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 111112221220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164701377792).

111112221220 is an abundant number, since it is smaller than the sum of its proper divisors (218290534364).

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

111112221220 is a wasteful number, since it uses less digits than its factorization.

111112221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22011 (or 21998 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 111112221220 its reverse (22122211111), we get a palindrome (133234432331).

The spelling of 111112221220 in words is "one hundred eleven billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twenty".