320477021 has 2 divisors, whose sum is σ = 320477022. Its totient is φ = 320477020.

The previous prime is 320476997. The next prime is 320477063. The reversal of 320477021 is 120774023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 247716121 + 72760900 = 15739^2 + 8530^2 .

It is an emirp because it is prime and its reverse (120774023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320477021 - 2¹⁸ = 320214877 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320417021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160238510 + 160238511.

It is an arithmetic number, because the mean of its divisors is an integer number (160238511).

Almost surely, 2^320477021 is an apocalyptic number.

It is an amenable number.

320477021 is a deficient number, since it is larger than the sum of its proper divisors (1).

320477021 is an equidigital number, since it uses as much as digits as its factorization.

320477021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 320477021 is about 17901.8719970846. The cubic root of 320477021 is about 684.3300826104.

The spelling of 320477021 in words is "three hundred twenty million, four hundred seventy-seven thousand, twenty-one".