12217138 has 8 divisors (see below), whose sum is σ = 18427500. Its totient is φ = 6074640.

The previous prime is 12217109. The next prime is 12217147. The reversal of 12217138 is 83171221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12131289 + 85849 = 3483^2 + 293^2 .

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

It is a super-2 number, since 2×12217138² = 298516921822088, which contains 22 as substring.

It is an unprimeable number.

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, 16513 + ... + 17236.

Almost surely, 2^12217138 is an apocalyptic number.

12217138 is a deficient number, since it is larger than the sum of its proper divisors (6210362).

12217138 is a wasteful number, since it uses less digits than its factorization.

12217138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33932.

The product of its digits is 672, while the sum is 25.

The square root of 12217138 is about 3495.3022759126. The cubic root of 12217138 is about 230.3154964547.

Adding to 12217138 its reverse (83171221), we get a palindrome (95388359).

The spelling of 12217138 in words is "twelve million, two hundred seventeen thousand, one hundred thirty-eight".