111231222120 has 48 divisors (see below), whose sum is σ = 361501473060. Its totient is φ = 29661659136.

The previous prime is 111231222103. The next prime is 111231222127. The reversal of 111231222120 is 21222132111.

111231222120 is a `hidden beast` number, since 1 + 112 + 312 + 221 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 109133765316 + 2097456804 = 330354^2 + 45798^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 111231222093 and 111231222102.

It is not an unprimeable number, because it can be changed into a prime (111231222127) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 154487449 + ... + 154488168.

Almost surely, 2^111231222120 is an apocalyptic number.

111231222120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111231222120 is an abundant number, since it is smaller than the sum of its proper divisors (250270250940).

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

111231222120 is a wasteful number, since it uses less digits than its factorization.

111231222120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308975634 (or 308975627 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 111231222120 its reverse (21222132111), we get a palindrome (132453354231).

Subtracting from 111231222120 its reverse (21222132111), we obtain a palindrome (90009090009).

The spelling of 111231222120 in words is "one hundred eleven billion, two hundred thirty-one million, two hundred twenty-two thousand, one hundred twenty".