231323312121013 has 40 divisors (see below), whose sum is σ = 276350044862848. Its totient is φ = 193516598282112.

The previous prime is 231323312120983. The next prime is 231323312121019. The reversal of 231323312121013 is 310121213323132.

It is not a de Polignac number, because 231323312121013 - 2¹³ = 231323312112821 is a prime.

It is a super-2 number, since 2×231323312121013² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231323312121019) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 133042420 + ... + 134769922.

Almost surely, 2^{231323312121013} is an apocalyptic number.

It is an amenable number.

231323312121013 is a deficient number, since it is larger than the sum of its proper divisors (45026732741835).

231323312121013 is an equidigital number, since it uses as much as digits as its factorization.

231323312121013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728871 (or 1728850 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 231323312121013 its reverse (310121213323132), we get a palindrome (541444525444145).

The spelling of 231323312121013 in words is "two hundred thirty-one trillion, three hundred twenty-three billion, three hundred twelve million, one hundred twenty-one thousand, thirteen".