12021021091 has 2 divisors, whose sum is σ = 12021021092. Its totient is φ = 12021021090.

The previous prime is 12021021049. The next prime is 12021021119. The reversal of 12021021091 is 19012012021.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (19012012021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12021021091 - 2²³ = 12012632483 is a prime.

It is not a weakly prime, because it can be changed into another prime (12021021031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010510545 + 6010510546.

It is an arithmetic number, because the mean of its divisors is an integer number (6010510546).

Almost surely, 2^12021021091 is an apocalyptic number.

12021021091 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021021091 is an equidigital number, since it uses as much as digits as its factorization.

12021021091 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 12021021091 in words is "twelve billion, twenty-one million, twenty-one thousand, ninety-one".