12123218 has 8 divisors (see below), whose sum is σ = 18811980. Its totient is φ = 5852560.

The previous prime is 12123217. The next prime is 12123239. The reversal of 12123218 is 81232121.

It can be written as a sum of positive squares in 2 ways, for example, as 11812969 + 310249 = 3437^2 + 557^2 .

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

It is a super-3 number, since 3×12123218³ (a number of 22 digits) contains 333 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 12123218.

It is not an unprimeable number, because it can be changed into a prime (12123211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104453 + ... + 104568.

Almost surely, 2^12123218 is an apocalyptic number.

12123218 is a deficient number, since it is larger than the sum of its proper divisors (6688762).

12123218 is a wasteful number, since it uses less digits than its factorization.

12123218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209052.

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

The square root of 12123218 is about 3481.8411796060. The cubic root of 12123218 is about 229.7237894102.

Adding to 12123218 its reverse (81232121), we get a palindrome (93355339).

The spelling of 12123218 in words is "twelve million, one hundred twenty-three thousand, two hundred eighteen".