321700475765621 has 2 divisors, whose sum is σ = 321700475765622. Its totient is φ = 321700475765620.

The previous prime is 321700475765611. The next prime is 321700475765671. The reversal of 321700475765621 is 126567574007123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 280592181784996 + 41108293980625 = 16750886^2 + 6411575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321700475765621 is a prime.

It is a super-2 number, since 2×321700475765621² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321700475765611) 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, 160850237882810 + 160850237882811.

It is an arithmetic number, because the mean of its divisors is an integer number (160850237882811).

Almost surely, 2^{321700475765621} is an apocalyptic number.

It is an amenable number.

321700475765621 is a deficient number, since it is larger than the sum of its proper divisors (1).

321700475765621 is an equidigital number, since it uses as much as digits as its factorization.

321700475765621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14817600, while the sum is 56.

The spelling of 321700475765621 in words is "three hundred twenty-one trillion, seven hundred billion, four hundred seventy-five million, seven hundred sixty-five thousand, six hundred twenty-one".