313123012021 has 2 divisors, whose sum is σ = 313123012022. Its totient is φ = 313123012020.

The previous prime is 313123012001. The next prime is 313123012039. The reversal of 313123012021 is 120210321313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 312067476900 + 1055535121 = 558630^2 + 32489^2 .

It is an emirp because it is prime and its reverse (120210321313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 313123012021 - 2³⁷ = 175684058549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 313123012021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313123012001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156561506010 + 156561506011.

It is an arithmetic number, because the mean of its divisors is an integer number (156561506011).

Almost surely, 2^313123012021 is an apocalyptic number.

It is an amenable number.

313123012021 is a deficient number, since it is larger than the sum of its proper divisors (1).

313123012021 is an equidigital number, since it uses as much as digits as its factorization.

313123012021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 313123012021 its reverse (120210321313), we get a palindrome (433333333334).

The spelling of 313123012021 in words is "three hundred thirteen billion, one hundred twenty-three million, twelve thousand, twenty-one".