12512218 has 4 divisors (see below), whose sum is σ = 18768330. Its totient is φ = 6256108.

The previous prime is 12512191. The next prime is 12512231. The reversal of 12512218 is 81221521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81221521 = 239 ⋅339839.

It can be written as a sum of positive squares in only one way, i.e., 12510369 + 1849 = 3537^2 + 43^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3128053 + ... + 3128056.

Almost surely, 2^12512218 is an apocalyptic number.

12512218 is a deficient number, since it is larger than the sum of its proper divisors (6256112).

12512218 is an equidigital number, since it uses as much as digits as its factorization.

12512218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6256111.

The product of its digits is 320, while the sum is 22.

The square root of 12512218 is about 3537.2613700432. The cubic root of 12512218 is about 232.1550316343.

Adding to 12512218 its reverse (81221521), we get a palindrome (93733739).

The spelling of 12512218 in words is "twelve million, five hundred twelve thousand, two hundred eighteen".