12091309121 has 4 divisors (see below), whose sum is σ = 12092540244. Its totient is φ = 12090078000.

The previous prime is 12091309081. The next prime is 12091309141. The reversal of 12091309121 is 12190319021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12190319021 = 4799 ⋅2540179.

It can be written as a sum of positive squares in 2 ways, for example, as 11936655025 + 154654096 = 109255^2 + 12436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12091309121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12091309141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600710 + ... + 620511.

It is an arithmetic number, because the mean of its divisors is an integer number (3023135061).

Almost surely, 2^12091309121 is an apocalyptic number.

It is an amenable number.

12091309121 is a deficient number, since it is larger than the sum of its proper divisors (1231123).

12091309121 is an equidigital number, since it uses as much as digits as its factorization.

12091309121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231122.

The product of its (nonzero) digits is 972, while the sum is 29.

The spelling of 12091309121 in words is "twelve billion, ninety-one million, three hundred nine thousand, one hundred twenty-one".