321101605325261 has 2 divisors, whose sum is σ = 321101605325262. Its totient is φ = 321101605325260.

The previous prime is 321101605325251. The next prime is 321101605325269. The reversal of 321101605325261 is 162523506101123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 282329887155625 + 38771718169636 = 16802675^2 + 6226694^2 .

It is a cyclic number.

It is not a de Polignac number, because 321101605325261 - 2⁶ = 321101605325197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321101605325269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160550802662630 + 160550802662631.

It is an arithmetic number, because the mean of its divisors is an integer number (160550802662631).

Almost surely, 2^{321101605325261} is an apocalyptic number.

It is an amenable number.

321101605325261 is a deficient number, since it is larger than the sum of its proper divisors (1).

321101605325261 is an equidigital number, since it uses as much as digits as its factorization.

321101605325261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 321101605325261 in words is "three hundred twenty-one trillion, one hundred one billion, six hundred five million, three hundred twenty-five thousand, two hundred sixty-one".