231310313021 has 2 divisors, whose sum is σ = 231310313022. Its totient is φ = 231310313020.

The previous prime is 231310313011. The next prime is 231310313023. The reversal of 231310313021 is 120313013132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201947776996 + 29362536025 = 449386^2 + 171355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231310313021 is a prime.

Together with 231310313023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 231310312984 and 231310313002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231310313023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115655156510 + 115655156511.

It is an arithmetic number, because the mean of its divisors is an integer number (115655156511).

Almost surely, 2^231310313021 is an apocalyptic number.

It is an amenable number.

231310313021 is a deficient number, since it is larger than the sum of its proper divisors (1).

231310313021 is an equidigital number, since it uses as much as digits as its factorization.

231310313021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 231310313021 its reverse (120313013132), we get a palindrome (351623326153).

The spelling of 231310313021 in words is "two hundred thirty-one billion, three hundred ten million, three hundred thirteen thousand, twenty-one".