12218331 has 8 divisors (see below), whose sum is σ = 16307280. Its totient is φ = 8137472.

The previous prime is 12218329. The next prime is 12218333. The reversal of 12218331 is 13381221.

It is an interprime number because it is at equal distance from previous prime (12218329) and next prime (12218333).

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

It is a cyclic number.

It is not a de Polignac number, because 12218331 - 2¹ = 12218329 is a prime.

It is a super-2 number, since 2×12218331² = 298575224851122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12218298 and 12218307.

It is not an unprimeable number, because it can be changed into a prime (12218333) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 4675 + ... + 6803.

It is an arithmetic number, because the mean of its divisors is an integer number (2038410).

Almost surely, 2^12218331 is an apocalyptic number.

12218331 is a deficient number, since it is larger than the sum of its proper divisors (4088949).

12218331 is a wasteful number, since it uses less digits than its factorization.

12218331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4045.

The product of its digits is 288, while the sum is 21.

The square root of 12218331 is about 3495.4729293759. The cubic root of 12218331 is about 230.3229929580.

Adding to 12218331 its reverse (13381221), we get a palindrome (25599552).

The spelling of 12218331 in words is "twelve million, two hundred eighteen thousand, three hundred thirty-one".