231311022121 has 16 divisors (see below), whose sum is σ = 247409078400. Its totient is φ = 215493758208.

The previous prime is 231311022073. The next prime is 231311022157. The reversal of 231311022121 is 121220113132.

231311022121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231311022121 - 2⁷ = 231311021993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231311022221) 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 15 ways as a sum of consecutive naturals, for example, 1826956 + ... + 1949458.

It is an arithmetic number, because the mean of its divisors is an integer number (15463067400).

Almost surely, 2^231311022121 is an apocalyptic number.

It is an amenable number.

231311022121 is a deficient number, since it is larger than the sum of its proper divisors (16098056279).

231311022121 is a wasteful number, since it uses less digits than its factorization.

231311022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123648.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 231311022121 its reverse (121220113132), we get a palindrome (352531135253).

The spelling of 231311022121 in words is "two hundred thirty-one billion, three hundred eleven million, twenty-two thousand, one hundred twenty-one".