195122111022821 has 2 divisors, whose sum is σ = 195122111022822. Its totient is φ = 195122111022820.

The previous prime is 195122111022767. The next prime is 195122111022859. The reversal of 195122111022821 is 128220111221591.

195122111022821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (195122111022859) can be obtained adding 195122111022821 to its sum of digits (38).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190558311969796 + 4563799053025 = 13804286^2 + 2136305^2 .

It is a cyclic number.

It is not a de Polignac number, because 195122111022821 - 2¹⁴ = 195122111006437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195122111322821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97561055511410 + 97561055511411.

It is an arithmetic number, because the mean of its divisors is an integer number (97561055511411).

Almost surely, 2^{195122111022821} is an apocalyptic number.

It is an amenable number.

195122111022821 is a deficient number, since it is larger than the sum of its proper divisors (1).

195122111022821 is an equidigital number, since it uses as much as digits as its factorization.

195122111022821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 38.

The spelling of 195122111022821 in words is "one hundred ninety-five trillion, one hundred twenty-two billion, one hundred eleven million, twenty-two thousand, eight hundred twenty-one".