320343021313313 has 4 divisors (see below), whose sum is σ = 320759592213060. Its totient is φ = 319926450413568.

The previous prime is 320343021313303. The next prime is 320343021313321. The reversal of 320343021313313 is 313313120343023.

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 132256279074529 + 188086742238784 = 11500273^2 + 13714472^2 .

It is a cyclic number.

It is not a de Polignac number, because 320343021313313 - 2⁴ = 320343021313297 is a prime.

It is a super-2 number, since 2×320343021313313² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 320343021313313.

It is not an unprimeable number, because it can be changed into a prime (320343021313303) 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, 208285448720 + ... + 208285450257.

It is an arithmetic number, because the mean of its divisors is an integer number (80189898053265).

Almost surely, 2^{320343021313313} is an apocalyptic number.

It is an amenable number.

320343021313313 is a deficient number, since it is larger than the sum of its proper divisors (416570899747).

320343021313313 is an equidigital number, since it uses as much as digits as its factorization.

320343021313313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416570899746.

The product of its (nonzero) digits is 34992, while the sum is 32.

Adding to 320343021313313 its reverse (313313120343023), we get a palindrome (633656141656336).

The spelling of 320343021313313 in words is "three hundred twenty trillion, three hundred forty-three billion, twenty-one million, three hundred thirteen thousand, three hundred thirteen".