231111220120 has 64 divisors (see below), whose sum is σ = 567360288000. Its totient is φ = 84027511680.

The previous prime is 231111220117. The next prime is 231111220201. The reversal of 231111220120 is 21022111132.

It is a junction number, because it is equal to n+sod(n) for n = 231111220094 and 231111220103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3099031 + ... + 3172729.

It is an arithmetic number, because the mean of its divisors is an integer number (8865004500).

Almost surely, 2^231111220120 is an apocalyptic number.

231111220120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231111220120 is an abundant number, since it is smaller than the sum of its proper divisors (336249067880).

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

231111220120 is a wasteful number, since it uses less digits than its factorization.

231111220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80848 (or 80844 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 231111220120 its reverse (21022111132), we get a palindrome (252133331252).

The spelling of 231111220120 in words is "two hundred thirty-one billion, one hundred eleven million, two hundred twenty thousand, one hundred twenty".