11111011110209 has 2 divisors, whose sum is σ = 11111011110210. Its totient is φ = 11111011110208.

The previous prime is 11111011110163. The next prime is 11111011110211. The reversal of 11111011110209 is 90201111011111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11110922223025 + 88887184 = 3333305^2 + 9428^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111011110209 - 2²⁰ = 11111010061633 is a prime.

Together with 11111011110211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11111011110289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555505555104 + 5555505555105.

It is an arithmetic number, because the mean of its divisors is an integer number (5555505555105).

Almost surely, 2^{11111011110209} is an apocalyptic number.

It is an amenable number.

11111011110209 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111011110209 is an equidigital number, since it uses as much as digits as its factorization.

11111011110209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 20.

The spelling of 11111011110209 in words is "eleven trillion, one hundred eleven billion, eleven million, one hundred ten thousand, two hundred nine".