12021000191 has 2 divisors, whose sum is σ = 12021000192. Its totient is φ = 12021000190.

The previous prime is 12021000143. The next prime is 12021000353. The reversal of 12021000191 is 19100012021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12021000191 - 2⁶ = 12021000127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12021000091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010500095 + 6010500096.

It is an arithmetic number, because the mean of its divisors is an integer number (6010500096).

Almost surely, 2^12021000191 is an apocalyptic number.

12021000191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021000191 is an equidigital number, since it uses as much as digits as its factorization.

12021000191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 12021000191 in words is "twelve billion, twenty-one million, one hundred ninety-one", and thus it is an aban number.