1313203323221 has 2 divisors, whose sum is σ = 1313203323222. Its totient is φ = 1313203323220.

The previous prime is 1313203323143. The next prime is 1313203323241. The reversal of 1313203323221 is 1223233023131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1300033236100 + 13170087121 = 1140190^2 + 114761^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313203323221 - 2³⁰ = 1312129581397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313203323241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656601661610 + 656601661611.

It is an arithmetic number, because the mean of its divisors is an integer number (656601661611).

Almost surely, 2^{1313203323221} is an apocalyptic number.

It is an amenable number.

1313203323221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313203323221 is an equidigital number, since it uses as much as digits as its factorization.

1313203323221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 1313203323221 its reverse (1223233023131), we get a palindrome (2536436346352).

The spelling of 1313203323221 in words is "one trillion, three hundred thirteen billion, two hundred three million, three hundred twenty-three thousand, two hundred twenty-one".