12012120091 has 2 divisors, whose sum is σ = 12012120092. Its totient is φ = 12012120090.

The previous prime is 12012120077. The next prime is 12012120097. The reversal of 12012120091 is 19002121021.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12012120091 - 2⁵ = 12012120059 is a prime.

It is not a weakly prime, because it can be changed into another prime (12012120097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006060045 + 6006060046.

It is an arithmetic number, because the mean of its divisors is an integer number (6006060046).

Almost surely, 2^12012120091 is an apocalyptic number.

12012120091 is a deficient number, since it is larger than the sum of its proper divisors (1).

12012120091 is an equidigital number, since it uses as much as digits as its factorization.

12012120091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 12012120091 in words is "twelve billion, twelve million, one hundred twenty thousand, ninety-one".