212371686809 has 2 divisors, whose sum is σ = 212371686810. Its totient is φ = 212371686808.

The previous prime is 212371686739. The next prime is 212371686817. The reversal of 212371686809 is 908686173212.

212371686809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199783968784 + 12587718025 = 446972^2 + 112195^2 .

It is a cyclic number.

It is not a de Polignac number, because 212371686809 - 2³⁶ = 143652210073 is a prime.

It is not a weakly prime, because it can be changed into another prime (212371686899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106185843404 + 106185843405.

It is an arithmetic number, because the mean of its divisors is an integer number (106185843405).

Almost surely, 2^212371686809 is an apocalyptic number.

It is an amenable number.

212371686809 is a deficient number, since it is larger than the sum of its proper divisors (1).

212371686809 is an equidigital number, since it uses as much as digits as its factorization.

212371686809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The spelling of 212371686809 in words is "two hundred twelve billion, three hundred seventy-one million, six hundred eighty-six thousand, eight hundred nine".