320123203400321 has 2 divisors, whose sum is σ = 320123203400322. Its totient is φ = 320123203400320.

The previous prime is 320123203400317. The next prime is 320123203400477. The reversal of 320123203400321 is 123004302321023.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186308304270400 + 133814899129921 = 13649480^2 + 11567839^2 .

It is a cyclic number.

It is not a de Polignac number, because 320123203400321 - 2² = 320123203400317 is a prime.

It is not a weakly prime, because it can be changed into another prime (320123203400311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160061601700160 + 160061601700161.

It is an arithmetic number, because the mean of its divisors is an integer number (160061601700161).

Almost surely, 2^{320123203400321} is an apocalyptic number.

It is an amenable number.

320123203400321 is a deficient number, since it is larger than the sum of its proper divisors (1).

320123203400321 is an equidigital number, since it uses as much as digits as its factorization.

320123203400321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 320123203400321 its reverse (123004302321023), we get a palindrome (443127505721344).

The spelling of 320123203400321 in words is "three hundred twenty trillion, one hundred twenty-three billion, two hundred three million, four hundred thousand, three hundred twenty-one".