321220212959857 has 2 divisors, whose sum is σ = 321220212959858. Its totient is φ = 321220212959856.

The previous prime is 321220212959851. The next prime is 321220212959879. The reversal of 321220212959857 is 758959212022123.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318047311522161 + 3172901437696 = 17833881^2 + 1781264^2 .

It is a cyclic number.

It is not a de Polignac number, because 321220212959857 - 2⁷ = 321220212959729 is a prime.

It is not a weakly prime, because it can be changed into another prime (321220212959851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160610106479928 + 160610106479929.

It is an arithmetic number, because the mean of its divisors is an integer number (160610106479929).

Almost surely, 2^{321220212959857} is an apocalyptic number.

It is an amenable number.

321220212959857 is a deficient number, since it is larger than the sum of its proper divisors (1).

321220212959857 is an equidigital number, since it uses as much as digits as its factorization.

321220212959857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10886400, while the sum is 58.

The spelling of 321220212959857 in words is "three hundred twenty-one trillion, two hundred twenty billion, two hundred twelve million, nine hundred fifty-nine thousand, eight hundred fifty-seven".