231112022121 has 10 divisors (see below), whose sum is σ = 345241415882. Its totient is φ = 154074681360.

The previous prime is 231112022111. The next prime is 231112022209. The reversal of 231112022121 is 121220211132.

It can be written as a sum of positive squares in only one way, i.e., 228216398400 + 2895623721 = 477720^2 + 53811^2 .

It is not a de Polignac number, because 231112022121 - 2⁷ = 231112021993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231112022094 and 231112022103.

It is not an unprimeable number, because it can be changed into a prime (231112022111) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1426617340 + ... + 1426617501.

Almost surely, 2^231112022121 is an apocalyptic number.

It is an amenable number.

231112022121 is a deficient number, since it is larger than the sum of its proper divisors (114129393761).

231112022121 is an equidigital number, since it uses as much as digits as its factorization.

231112022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2853234853 (or 2853234844 counting only the distinct ones).

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

Adding to 231112022121 its reverse (121220211132), we get a palindrome (352332233253).

The spelling of 231112022121 in words is "two hundred thirty-one billion, one hundred twelve million, twenty-two thousand, one hundred twenty-one".