316331455021 has 2 divisors, whose sum is σ = 316331455022. Its totient is φ = 316331455020.

The previous prime is 316331455009. The next prime is 316331455049. The reversal of 316331455021 is 120554133613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227729384100 + 88602070921 = 477210^2 + 297661^2 .

It is a cyclic number.

It is not a de Polignac number, because 316331455021 - 2⁷ = 316331454893 is a prime.

It is a super-2 number, since 2×316331455021² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (316331455421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158165727510 + 158165727511.

It is an arithmetic number, because the mean of its divisors is an integer number (158165727511).

Almost surely, 2^316331455021 is an apocalyptic number.

It is an amenable number.

316331455021 is a deficient number, since it is larger than the sum of its proper divisors (1).

316331455021 is an equidigital number, since it uses as much as digits as its factorization.

316331455021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 34.

Adding to 316331455021 its reverse (120554133613), we get a palindrome (436885588634).

The spelling of 316331455021 in words is "three hundred sixteen billion, three hundred thirty-one million, four hundred fifty-five thousand, twenty-one".