12012220091 has 2 divisors, whose sum is σ = 12012220092. Its totient is φ = 12012220090.

The previous prime is 12012220079. The next prime is 12012220093. The reversal of 12012220091 is 19002221021.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12012220091 - 2²² = 12008025787 is a prime.

Together with 12012220093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12012220093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006110045 + 6006110046.

It is an arithmetic number, because the mean of its divisors is an integer number (6006110046).

Almost surely, 2^12012220091 is an apocalyptic number.

12012220091 is a deficient number, since it is larger than the sum of its proper divisors (1).

12012220091 is an equidigital number, since it uses as much as digits as its factorization.

12012220091 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 20.

The spelling of 12012220091 in words is "twelve billion, twelve million, two hundred twenty thousand, ninety-one".