321340927575781 has 2 divisors, whose sum is σ = 321340927575782. Its totient is φ = 321340927575780.

The previous prime is 321340927575691. The next prime is 321340927575827. The reversal of 321340927575781 is 187575729043123.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 264923312896225 + 56417614679556 = 16276465^2 + 7511166^2 .

It is a cyclic number.

It is not a de Polignac number, because 321340927575781 - 2¹¹ = 321340927573733 is a prime.

It is a super-2 number, since 2×321340927575781² (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 (321340927575581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160670463787890 + 160670463787891.

It is an arithmetic number, because the mean of its divisors is an integer number (160670463787891).

Almost surely, 2^{321340927575781} is an apocalyptic number.

It is an amenable number.

321340927575781 is a deficient number, since it is larger than the sum of its proper divisors (1).

321340927575781 is an equidigital number, since it uses as much as digits as its factorization.

321340927575781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 88905600, while the sum is 64.

The spelling of 321340927575781 in words is "three hundred twenty-one trillion, three hundred forty billion, nine hundred twenty-seven million, five hundred seventy-five thousand, seven hundred eighty-one".