12111201209 has 2 divisors, whose sum is σ = 12111201210. Its totient is φ = 12111201208.

The previous prime is 12111201187. The next prime is 12111201253. The reversal of 12111201209 is 90210211121.

12111201209 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., 10249537600 + 1861663609 = 101240^2 + 43147^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12111201209 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12111201259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055600604 + 6055600605.

It is an arithmetic number, because the mean of its divisors is an integer number (6055600605).

Almost surely, 2^12111201209 is an apocalyptic number.

It is an amenable number.

12111201209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111201209 is an equidigital number, since it uses as much as digits as its factorization.

12111201209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 12111201209 in words is "twelve billion, one hundred eleven million, two hundred one thousand, two hundred nine".