111111112221220 has 12 divisors (see below), whose sum is σ = 233333335664604. Its totient is φ = 44444444888480.

The previous prime is 111111112221077. The next prime is 111111112221311. The reversal of 111111112221220 is 22122211111111.

It can be written as a sum of positive squares in 2 ways, for example, as 13249832961024 + 97861279260196 = 3640032^2 + 9892486^2 .

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, 2777777805511 + ... + 2777777805550.

It is an arithmetic number, because the mean of its divisors is an integer number (19444444638717).

Almost surely, 2^{111111112221220} is an apocalyptic number.

111111112221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111111112221220 is an abundant number, since it is smaller than the sum of its proper divisors (122222223443384).

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

111111112221220 is a wasteful number, since it uses less digits than its factorization.

111111112221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555555611070 (or 5555555611068 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 111111112221220 its reverse (22122211111111), we get a palindrome (133233323332331).

The spelling of 111111112221220 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twenty".