321313242521 has 2 divisors, whose sum is σ = 321313242522. Its totient is φ = 321313242520.

The previous prime is 321313242457. The next prime is 321313242553. The reversal of 321313242521 is 125242313123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179997396121 + 141315846400 = 424261^2 + 375920^2 .

It is a cyclic number.

It is not a de Polignac number, because 321313242521 - 2⁶ = 321313242457 is a prime.

It is not a weakly prime, because it can be changed into another prime (321313242571) 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, 160656621260 + 160656621261.

It is an arithmetic number, because the mean of its divisors is an integer number (160656621261).

Almost surely, 2^321313242521 is an apocalyptic number.

It is an amenable number.

321313242521 is a deficient number, since it is larger than the sum of its proper divisors (1).

321313242521 is an equidigital number, since it uses as much as digits as its factorization.

321313242521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 29.

Adding to 321313242521 its reverse (125242313123), we get a palindrome (446555555644).

The spelling of 321313242521 in words is "three hundred twenty-one billion, three hundred thirteen million, two hundred forty-two thousand, five hundred twenty-one".