195122111322821 has 2 divisors, whose sum is σ = 195122111322822. Its totient is φ = 195122111322820.

The previous prime is 195122111322781. The next prime is 195122111322839. The reversal of 195122111322821 is 128223111221591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178239988929025 + 16882122393796 = 13350655^2 + 4108786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195122111322821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195122111322851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97561055661410 + 97561055661411.

It is an arithmetic number, because the mean of its divisors is an integer number (97561055661411).

Almost surely, 2^{195122111322821} is an apocalyptic number.

It is an amenable number.

195122111322821 is a deficient number, since it is larger than the sum of its proper divisors (1).

195122111322821 is an equidigital number, since it uses as much as digits as its factorization.

195122111322821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 41.

The spelling of 195122111322821 in words is "one hundred ninety-five trillion, one hundred twenty-two billion, one hundred eleven million, three hundred twenty-two thousand, eight hundred twenty-one".