12271271 has 4 divisors (see below), whose sum is σ = 12278952. Its totient is φ = 12263592.

The previous prime is 12271261. The next prime is 12271279. The reversal of 12271271 is 17217221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12271271 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 (12271279) 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, 440 + ... + 4973.

It is an arithmetic number, because the mean of its divisors is an integer number (3069738).

Almost surely, 2^12271271 is an apocalyptic number.

12271271 is a deficient number, since it is larger than the sum of its proper divisors (7681).

12271271 is an equidigital number, since it uses as much as digits as its factorization.

12271271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7680.

The product of its digits is 392, while the sum is 23.

The square root of 12271271 is about 3503.0373963177. The cubic root of 12271271 is about 230.6551641032.

Adding to 12271271 its reverse (17217221), we get a palindrome (29488492).

The spelling of 12271271 in words is "twelve million, two hundred seventy-one thousand, two hundred seventy-one".