12216022191 has 6 divisors (see below), whose sum is σ = 17645365400. Its totient is φ = 8144014788.

The previous prime is 12216022187. The next prime is 12216022211. The reversal of 12216022191 is 19122061221.

12216022191 is a `hidden beast` number, since 12 + 21 + 602 + 21 + 9 + 1 = 666.

12216022191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12216022191 - 2² = 12216022187 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 (12216022141) 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 in 5 ways as a sum of consecutive naturals, for example, 678667891 + ... + 678667908.

Almost surely, 2^12216022191 is an apocalyptic number.

12216022191 is a deficient number, since it is larger than the sum of its proper divisors (5429343209).

12216022191 is a wasteful number, since it uses less digits than its factorization.

12216022191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357335805 (or 1357335802 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The spelling of 12216022191 in words is "twelve billion, two hundred sixteen million, twenty-two thousand, one hundred ninety-one".