12221211091 has 2 divisors, whose sum is σ = 12221211092. Its totient is φ = 12221211090.

The previous prime is 12221211083. The next prime is 12221211109. The reversal of 12221211091 is 19011212221.

12221211091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (12221211109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (19011212221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12221211091 - 2³ = 12221211083 is a prime.

It is not a weakly prime, because it can be changed into another prime (12221211031) 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 as a sum of consecutive naturals, namely, 6110605545 + 6110605546.

It is an arithmetic number, because the mean of its divisors is an integer number (6110605546).

Almost surely, 2^12221211091 is an apocalyptic number.

12221211091 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221211091 is an equidigital number, since it uses as much as digits as its factorization.

12221211091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 12221211091 in words is "twelve billion, two hundred twenty-one million, two hundred eleven thousand, ninety-one".