321044431021 has 2 divisors, whose sum is σ = 321044431022. Its totient is φ = 321044431020.

The previous prime is 321044431013. The next prime is 321044431051. The reversal of 321044431021 is 120134440123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183488006025 + 137556424996 = 428355^2 + 370886^2 .

It is a cyclic number.

It is not a de Polignac number, because 321044431021 - 2³ = 321044431013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321044431051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160522215510 + 160522215511.

It is an arithmetic number, because the mean of its divisors is an integer number (160522215511).

Almost surely, 2^321044431021 is an apocalyptic number.

It is an amenable number.

321044431021 is a deficient number, since it is larger than the sum of its proper divisors (1).

321044431021 is an equidigital number, since it uses as much as digits as its factorization.

321044431021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 321044431021 its reverse (120134440123), we get a palindrome (441178871144).

The spelling of 321044431021 in words is "three hundred twenty-one billion, forty-four million, four hundred thirty-one thousand, twenty-one".