321440143344373 has 2 divisors, whose sum is σ = 321440143344374. Its totient is φ = 321440143344372.

The previous prime is 321440143344283. The next prime is 321440143344391. The reversal of 321440143344373 is 373443341044123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173181441464964 + 148258701879409 = 13159842^2 + 12176153^2 .

It is a cyclic number.

It is not a de Polignac number, because 321440143344373 - 2²¹ = 321440141247221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321440143044373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160720071672186 + 160720071672187.

It is an arithmetic number, because the mean of its divisors is an integer number (160720071672187).

Almost surely, 2^{321440143344373} is an apocalyptic number.

It is an amenable number.

321440143344373 is a deficient number, since it is larger than the sum of its proper divisors (1).

321440143344373 is an equidigital number, since it uses as much as digits as its factorization.

321440143344373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3483648, while the sum is 46.

Adding to 321440143344373 its reverse (373443341044123), we get a palindrome (694883484388496).

The spelling of 321440143344373 in words is "three hundred twenty-one trillion, four hundred forty billion, one hundred forty-three million, three hundred forty-four thousand, three hundred seventy-three".