12011211191 has 6 divisors (see below), whose sum is σ = 13972225320. Its totient is φ = 10295323836.

The previous prime is 12011211187. The next prime is 12011211221. The reversal of 12011211191 is 19111211021.

It is not a de Polignac number, because 12011211191 - 2² = 12011211187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011211151) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 122563331 + ... + 122563428.

It is an arithmetic number, because the mean of its divisors is an integer number (2328704220).

Almost surely, 2^12011211191 is an apocalyptic number.

12011211191 is a deficient number, since it is larger than the sum of its proper divisors (1961014129).

12011211191 is an equidigital number, since it uses as much as digits as its factorization.

12011211191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245126773 (or 245126766 counting only the distinct ones).

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

The spelling of 12011211191 in words is "twelve billion, eleven million, two hundred eleven thousand, one hundred ninety-one".