320313221 has 2 divisors, whose sum is σ = 320313222. Its totient is φ = 320313220.

The previous prime is 320313187. The next prime is 320313233. The reversal of 320313221 is 122313023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320052100 + 261121 = 17890^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 320313221 - 2¹⁸ = 320051077 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320313221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320313281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160156610 + 160156611.

It is an arithmetic number, because the mean of its divisors is an integer number (160156611).

Almost surely, 2^320313221 is an apocalyptic number.

It is an amenable number.

320313221 is a deficient number, since it is larger than the sum of its proper divisors (1).

320313221 is an equidigital number, since it uses as much as digits as its factorization.

320313221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 320313221 is about 17897.2964718138. The cubic root of 320313221 is about 684.2134727205.

Adding to 320313221 its reverse (122313023), we get a palindrome (442626244).

The spelling of 320313221 in words is "three hundred twenty million, three hundred thirteen thousand, two hundred twenty-one".