12991108271 has 4 divisors (see below), whose sum is σ = 13293227112. Its totient is φ = 12688989432.

The previous prime is 12991108267. The next prime is 12991108307. The reversal of 12991108271 is 17280119921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17280119921 = 223 ⋅77489327.

It is a cyclic number.

It is not a de Polignac number, because 12991108271 - 2² = 12991108267 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12991108231) 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, 151059356 + ... + 151059441.

It is an arithmetic number, because the mean of its divisors is an integer number (3323306778).

Almost surely, 2^12991108271 is an apocalyptic number.

12991108271 is a deficient number, since it is larger than the sum of its proper divisors (302118841).

12991108271 is an equidigital number, since it uses as much as digits as its factorization.

12991108271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302118840.

The product of its (nonzero) digits is 18144, while the sum is 41.

The spelling of 12991108271 in words is "twelve billion, nine hundred ninety-one million, one hundred eight thousand, two hundred seventy-one".