12218311 has 8 divisors (see below), whose sum is σ = 14698880. Its totient is φ = 9921528.

The previous prime is 12218299. The next prime is 12218329. The reversal of 12218311 is 11381221.

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 12218311 - 2⁷ = 12218183 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12218111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45801 + ... + 46066.

It is an arithmetic number, because the mean of its divisors is an integer number (1837360).

Almost surely, 2^12218311 is an apocalyptic number.

12218311 is a deficient number, since it is larger than the sum of its proper divisors (2480569).

12218311 is an equidigital number, since it uses as much as digits as its factorization.

12218311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91893.

The product of its digits is 96, while the sum is 19.

The square root of 12218311 is about 3495.4700685316. The cubic root of 12218311 is about 230.3228672872.

Adding to 12218311 its reverse (11381221), we get a palindrome (23599532).

The spelling of 12218311 in words is "twelve million, two hundred eighteen thousand, three hundred eleven".