321320344021 has 2 divisors, whose sum is σ = 321320344022. Its totient is φ = 321320344020.

The previous prime is 321320343991. The next prime is 321320344039. The reversal of 321320344021 is 120443023123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 274335012900 + 46985331121 = 523770^2 + 216761^2 .

It is a cyclic number.

It is not a de Polignac number, because 321320344021 - 2²¹ = 321318246869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321320344621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160660172010 + 160660172011.

It is an arithmetic number, because the mean of its divisors is an integer number (160660172011).

Almost surely, 2^321320344021 is an apocalyptic number.

It is an amenable number.

321320344021 is a deficient number, since it is larger than the sum of its proper divisors (1).

321320344021 is an equidigital number, since it uses as much as digits as its factorization.

321320344021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 321320344021 its reverse (120443023123), we get a palindrome (441763367144).

The spelling of 321320344021 in words is "three hundred twenty-one billion, three hundred twenty million, three hundred forty-four thousand, twenty-one".