11101221191 has 2 divisors, whose sum is σ = 11101221192. Its totient is φ = 11101221190.

The previous prime is 11101221167. The next prime is 11101221227. The reversal of 11101221191 is 19112210111.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11101221191 is a prime.

It is a super-2 number, since 2×11101221191² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11101221161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550610595 + 5550610596.

It is an arithmetic number, because the mean of its divisors is an integer number (5550610596).

Almost surely, 2^11101221191 is an apocalyptic number.

11101221191 is a deficient number, since it is larger than the sum of its proper divisors (1).

11101221191 is an equidigital number, since it uses as much as digits as its factorization.

11101221191 is an evil number, because the sum of its binary digits is even.

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

The spelling of 11101221191 in words is "eleven billion, one hundred one million, two hundred twenty-one thousand, one hundred ninety-one".