12271018 has 4 divisors (see below), whose sum is σ = 18406530. Its totient is φ = 6135508.

The previous prime is 12271003. The next prime is 12271019. The reversal of 12271018 is 81017221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12271009 + 9 = 3503^2 + 3^2 .

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 12271018.

It is not an unprimeable number, because it can be changed into a prime (12271019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3067753 + ... + 3067756.

Almost surely, 2^12271018 is an apocalyptic number.

12271018 is a deficient number, since it is larger than the sum of its proper divisors (6135512).

12271018 is an equidigital number, since it uses as much as digits as its factorization.

12271018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6135511.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 12271018 is about 3503.0012846130. The cubic root of 12271018 is about 230.6535789330.

Adding to 12271018 its reverse (81017221), we get a palindrome (93288239).

The spelling of 12271018 in words is "twelve million, two hundred seventy-one thousand, eighteen".