313134331021 has 2 divisors, whose sum is σ = 313134331022. Its totient is φ = 313134331020.

The previous prime is 313134331019. The next prime is 313134331031. The reversal of 313134331021 is 120133431313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 251215473796 + 61918857225 = 501214^2 + 248835^2 .

It is a cyclic number.

It is not a de Polignac number, because 313134331021 - 2¹ = 313134331019 is a prime.

Together with 313134331019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313134331031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156567165510 + 156567165511.

It is an arithmetic number, because the mean of its divisors is an integer number (156567165511).

Almost surely, 2^313134331021 is an apocalyptic number.

It is an amenable number.

313134331021 is a deficient number, since it is larger than the sum of its proper divisors (1).

313134331021 is an equidigital number, since it uses as much as digits as its factorization.

313134331021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 313134331021 its reverse (120133431313), we get a palindrome (433267762334).

The spelling of 313134331021 in words is "three hundred thirteen billion, one hundred thirty-four million, three hundred thirty-one thousand, twenty-one".