12021031091 has 4 divisors (see below), whose sum is σ = 12094779912. Its totient is φ = 11947282272.

The previous prime is 12021031081. The next prime is 12021031097. The reversal of 12021031091 is 19013012021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19013012021 = 809 ⋅23501869.

It is a cyclic number.

It is not a de Polignac number, because 12021031091 - 2²² = 12016836787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021031097) 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, 36874166 + ... + 36874491.

It is an arithmetic number, because the mean of its divisors is an integer number (3023694978).

Almost surely, 2^12021031091 is an apocalyptic number.

12021031091 is a deficient number, since it is larger than the sum of its proper divisors (73748821).

12021031091 is an equidigital number, since it uses as much as digits as its factorization.

12021031091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73748820.

The product of its (nonzero) digits is 108, while the sum is 20.

The spelling of 12021031091 in words is "twelve billion, twenty-one million, thirty-one thousand, ninety-one".