231111112122 has 24 divisors (see below), whose sum is σ = 546262629120. Its totient is φ = 70033670280.

The previous prime is 231111112109. The next prime is 231111112147. The reversal of 231111112122 is 221211111132.

It is a happy number.

It is a super-2 number, since 2×231111112122² (a number of 24 digits) contains 22 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 231111112095 and 231111112104.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 583613722 + ... + 583614117.

It is an arithmetic number, because the mean of its divisors is an integer number (22760942880).

Almost surely, 2^231111112122 is an apocalyptic number.

231111112122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

231111112122 is an abundant number, since it is smaller than the sum of its proper divisors (315151516998).

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

231111112122 is a wasteful number, since it uses less digits than its factorization.

231111112122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167227858 (or 1167227855 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

Adding to 231111112122 its reverse (221211111132), we get a palindrome (452322223254).

The spelling of 231111112122 in words is "two hundred thirty-one billion, one hundred eleven million, one hundred twelve thousand, one hundred twenty-two".