311321421013 has 2 divisors, whose sum is σ = 311321421014. Its totient is φ = 311321421012.

The previous prime is 311321420941. The next prime is 311321421043. The reversal of 311321421013 is 310124123113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 281571380689 + 29750040324 = 530633^2 + 172482^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311321421013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311321421043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155660710506 + 155660710507.

It is an arithmetic number, because the mean of its divisors is an integer number (155660710507).

Almost surely, 2^311321421013 is an apocalyptic number.

It is an amenable number.

311321421013 is a deficient number, since it is larger than the sum of its proper divisors (1).

311321421013 is an equidigital number, since it uses as much as digits as its factorization.

311321421013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 311321421013 its reverse (310124123113), we get a palindrome (621445544126).

The spelling of 311321421013 in words is "three hundred eleven billion, three hundred twenty-one million, four hundred twenty-one thousand, thirteen".