111221222120 has 32 divisors (see below), whose sum is σ = 250294232520. Its totient is φ = 44480225280.

The previous prime is 111221222087. The next prime is 111221222143. The reversal of 111221222120 is 21222122111.

It can be written as a sum of positive squares in 4 ways, for example, as 79816420324 + 31404801796 = 282518^2 + 177214^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37877 + ... + 473156.

Almost surely, 2^111221222120 is an apocalyptic number.

111221222120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111221222120 is an abundant number, since it is smaller than the sum of its proper divisors (139073010400).

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

111221222120 is a wasteful number, since it uses less digits than its factorization.

111221222120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516485 (or 516481 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 111221222120 its reverse (21222122111), we get a palindrome (132443344231).

The spelling of 111221222120 in words is "one hundred eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty".