1313120311021 has 2 divisors, whose sum is σ = 1313120311022. Its totient is φ = 1313120311020.

The previous prime is 1313120310991. The next prime is 1313120311033. The reversal of 1313120311021 is 1201130213131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1076354375625 + 236765935396 = 1037475^2 + 486586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1313120311021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1313120311021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313120311421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656560155510 + 656560155511.

It is an arithmetic number, because the mean of its divisors is an integer number (656560155511).

Almost surely, 2^{1313120311021} is an apocalyptic number.

It is an amenable number.

1313120311021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313120311021 is an equidigital number, since it uses as much as digits as its factorization.

1313120311021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 1313120311021 its reverse (1201130213131), we get a palindrome (2514250524152).

The spelling of 1313120311021 in words is "one trillion, three hundred thirteen billion, one hundred twenty million, three hundred eleven thousand, twenty-one".