320421307 has 2 divisors, whose sum is σ = 320421308. Its totient is φ = 320421306.

The previous prime is 320421259. The next prime is 320421317. The reversal of 320421307 is 703124023.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 320421307 - 2¹⁵ = 320388539 is a prime.

It is not a weakly prime, because it can be changed into another prime (320421317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160210653 + 160210654.

It is an arithmetic number, because the mean of its divisors is an integer number (160210654).

Almost surely, 2^320421307 is an apocalyptic number.

320421307 is a deficient number, since it is larger than the sum of its proper divisors (1).

320421307 is an equidigital number, since it uses as much as digits as its factorization.

320421307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 320421307 is about 17900.3158352025. The cubic root of 320421307 is about 684.2904240459.

The spelling of 320421307 in words is "three hundred twenty million, four hundred twenty-one thousand, three hundred seven".