1313220310321 has 4 divisors (see below), whose sum is σ = 1314752656932. Its totient is φ = 1311687963712.

The previous prime is 1313220310309. The next prime is 1313220310327. The reversal of 1313220310321 is 1230130223131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1201621554225 + 111598756096 = 1096185^2 + 334064^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313220310321 - 2¹⁹ = 1313219786033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1313220310292 and 1313220310301.

It is not an unprimeable number, because it can be changed into a prime (1313220310327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 766172020 + ... + 766173733.

It is an arithmetic number, because the mean of its divisors is an integer number (328688164233).

Almost surely, 2^{1313220310321} is an apocalyptic number.

It is an amenable number.

1313220310321 is a deficient number, since it is larger than the sum of its proper divisors (1532346611).

1313220310321 is an equidigital number, since it uses as much as digits as its factorization.

1313220310321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532346610.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 1313220310321 its reverse (1230130223131), we get a palindrome (2543350533452).

The spelling of 1313220310321 in words is "one trillion, three hundred thirteen billion, two hundred twenty million, three hundred ten thousand, three hundred twenty-one".