320432423221 has 2 divisors, whose sum is σ = 320432423222. Its totient is φ = 320432423220.

The previous prime is 320432423219. The next prime is 320432423263. The reversal of 320432423221 is 122324234023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 262236168100 + 58196255121 = 512090^2 + 241239^2 .

It is a cyclic number.

It is not a de Polignac number, because 320432423221 - 2¹ = 320432423219 is a prime.

Together with 320432423219, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 320432423221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320432423821) 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, 160216211610 + 160216211611.

It is an arithmetic number, because the mean of its divisors is an integer number (160216211611).

Almost surely, 2^320432423221 is an apocalyptic number.

It is an amenable number.

320432423221 is a deficient number, since it is larger than the sum of its proper divisors (1).

320432423221 is an equidigital number, since it uses as much as digits as its factorization.

320432423221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 320432423221 its reverse (122324234023), we get a palindrome (442756657244).

The spelling of 320432423221 in words is "three hundred twenty billion, four hundred thirty-two million, four hundred twenty-three thousand, two hundred twenty-one".