320320313221 has 2 divisors, whose sum is σ = 320320313222. Its totient is φ = 320320313220.

The previous prime is 320320313219. The next prime is 320320313249. The reversal of 320320313221 is 122313023023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318817200321 + 1503112900 = 564639^2 + 38770^2 .

It is a cyclic number.

It is not a de Polignac number, because 320320313221 - 2¹ = 320320313219 is a prime.

Together with 320320313219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 320320313192 and 320320313201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320320313251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160160156610 + 160160156611.

It is an arithmetic number, because the mean of its divisors is an integer number (160160156611).

Almost surely, 2^320320313221 is an apocalyptic number.

It is an amenable number.

320320313221 is a deficient number, since it is larger than the sum of its proper divisors (1).

320320313221 is an equidigital number, since it uses as much as digits as its factorization.

320320313221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 320320313221 its reverse (122313023023), we get a palindrome (442633336244).

The spelling of 320320313221 in words is "three hundred twenty billion, three hundred twenty million, three hundred thirteen thousand, two hundred twenty-one".