320307392921 has 2 divisors, whose sum is σ = 320307392922. Its totient is φ = 320307392920.

The previous prime is 320307392863. The next prime is 320307392929. The reversal of 320307392921 is 129293703023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 246179707225 + 74127685696 = 496165^2 + 272264^2 .

It is an emirp because it is prime and its reverse (129293703023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320307392921 - 2⁶ = 320307392857 is a prime.

It is not a weakly prime, because it can be changed into another prime (320307392929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160153696460 + 160153696461.

It is an arithmetic number, because the mean of its divisors is an integer number (160153696461).

Almost surely, 2^320307392921 is an apocalyptic number.

It is an amenable number.

320307392921 is a deficient number, since it is larger than the sum of its proper divisors (1).

320307392921 is an equidigital number, since it uses as much as digits as its factorization.

320307392921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 41.

The spelling of 320307392921 in words is "three hundred twenty billion, three hundred seven million, three hundred ninety-two thousand, nine hundred twenty-one".