11111100122009 has 2 divisors, whose sum is σ = 11111100122010. Its totient is φ = 11111100122008.

The previous prime is 11111100121963. The next prime is 11111100122029. The reversal of 11111100122009 is 90022100111111.

It is an a-pointer prime, because the next prime (11111100122029) can be obtained adding 11111100122009 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9191489872009 + 1919610250000 = 3031747^2 + 1385500^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111100122009 - 2²⁰ = 11111099073433 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 (11111100122029) 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, 5555550061004 + 5555550061005.

It is an arithmetic number, because the mean of its divisors is an integer number (5555550061005).

Almost surely, 2^{11111100122009} is an apocalyptic number.

It is an amenable number.

11111100122009 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111100122009 is an equidigital number, since it uses as much as digits as its factorization.

11111100122009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 20.

The spelling of 11111100122009 in words is "eleven trillion, one hundred eleven billion, one hundred million, one hundred twenty-two thousand, nine".