12842167221809 has 2 divisors, whose sum is σ = 12842167221810. Its totient is φ = 12842167221808.

The previous prime is 12842167221797. The next prime is 12842167221841. The reversal of 12842167221809 is 90812276124821.

It is a happy number.

12842167221809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11933376798784 + 908790423025 = 3454472^2 + 953305^2 .

It is a cyclic number.

It is not a de Polignac number, because 12842167221809 - 2⁸ = 12842167221553 is a prime.

It is not a weakly prime, because it can be changed into another prime (12842167221859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6421083610904 + 6421083610905.

It is an arithmetic number, because the mean of its divisors is an integer number (6421083610905).

Almost surely, 2^{12842167221809} is an apocalyptic number.

It is an amenable number.

12842167221809 is a deficient number, since it is larger than the sum of its proper divisors (1).

12842167221809 is an equidigital number, since it uses as much as digits as its factorization.

12842167221809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1548288, while the sum is 53.

The spelling of 12842167221809 in words is "twelve trillion, eight hundred forty-two billion, one hundred sixty-seven million, two hundred twenty-one thousand, eight hundred nine".