11211102191 has 2 divisors, whose sum is σ = 11211102192. Its totient is φ = 11211102190.

The previous prime is 11211102187. The next prime is 11211102211. The reversal of 11211102191 is 19120111211.

It is an a-pointer prime, because the next prime (11211102211) can be obtained adding 11211102191 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11211102191 - 2² = 11211102187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211102121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605551095 + 5605551096.

It is an arithmetic number, because the mean of its divisors is an integer number (5605551096).

Almost surely, 2^11211102191 is an apocalyptic number.

11211102191 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211102191 is an equidigital number, since it uses as much as digits as its factorization.

11211102191 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 11211102191 in words is "eleven billion, two hundred eleven million, one hundred two thousand, one hundred ninety-one".