231311123320 has 32 divisors (see below), whose sum is σ = 524248945200. Its totient is φ = 91849086208.

The previous prime is 231311123291. The next prime is 231311123321. The reversal of 231311123320 is 23321113132.

It is a junction number, because it is equal to n+sod(n) for n = 231311123291 and 231311123300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231311123321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21099550 + ... + 21110509.

Almost surely, 2^231311123320 is an apocalyptic number.

231311123320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231311123320 is an abundant number, since it is smaller than the sum of its proper divisors (292937821880).

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

231311123320 is a wasteful number, since it uses less digits than its factorization.

231311123320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42210207 (or 42210203 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 231311123320 its reverse (23321113132), we get a palindrome (254632236452).

The spelling of 231311123320 in words is "two hundred thirty-one billion, three hundred eleven million, one hundred twenty-three thousand, three hundred twenty".