1313321111321 has 2 divisors, whose sum is σ = 1313321111322. Its totient is φ = 1313321111320.

The previous prime is 1313321111287. The next prime is 1313321111363. The reversal of 1313321111321 is 1231111233131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 785066881600 + 528254229721 = 886040^2 + 726811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1313321111321 is a prime.

It is not a weakly prime, because it can be changed into another prime (1313321111821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656660555660 + 656660555661.

It is an arithmetic number, because the mean of its divisors is an integer number (656660555661).

Almost surely, 2^{1313321111321} is an apocalyptic number.

It is an amenable number.

1313321111321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313321111321 is an equidigital number, since it uses as much as digits as its factorization.

1313321111321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 23.

Adding to 1313321111321 its reverse (1231111233131), we get a palindrome (2544432344452).

The spelling of 1313321111321 in words is "one trillion, three hundred thirteen billion, three hundred twenty-one million, one hundred eleven thousand, three hundred twenty-one".