321065371261 has 2 divisors, whose sum is σ = 321065371262. Its totient is φ = 321065371260.

The previous prime is 321065371243. The next prime is 321065371267. The reversal of 321065371261 is 162173560123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320531484025 + 533887236 = 566155^2 + 23106^2 .

It is an emirp because it is prime and its reverse (162173560123) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321065371261 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 321065371261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321065371267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160532685630 + 160532685631.

It is an arithmetic number, because the mean of its divisors is an integer number (160532685631).

Almost surely, 2^321065371261 is an apocalyptic number.

It is an amenable number.

321065371261 is a deficient number, since it is larger than the sum of its proper divisors (1).

321065371261 is an equidigital number, since it uses as much as digits as its factorization.

321065371261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 321065371261 in words is "three hundred twenty-one billion, sixty-five million, three hundred seventy-one thousand, two hundred sixty-one".