12221318 has 8 divisors (see below), whose sum is σ = 18351360. Its totient is φ = 6104200.

The previous prime is 12221273. The next prime is 12221327. The reversal of 12221318 is 81312221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×12221318² = 298721227314248, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12221318.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353 + ... + 4956.

It is an arithmetic number, because the mean of its divisors is an integer number (2293920).

Almost surely, 2^12221318 is an apocalyptic number.

12221318 is a deficient number, since it is larger than the sum of its proper divisors (6130042).

12221318 is a wasteful number, since it uses less digits than its factorization.

12221318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6462.

The product of its digits is 192, while the sum is 20.

The square root of 12221318 is about 3495.9001701994. The cubic root of 12221318 is about 230.3417603528.

Adding to 12221318 its reverse (81312221), we get a palindrome (93533539).

The spelling of 12221318 in words is "twelve million, two hundred twenty-one thousand, three hundred eighteen".