12216443 has 4 divisors (see below), whose sum is σ = 12227160. Its totient is φ = 12205728.

The previous prime is 12216439. The next prime is 12216493. The reversal of 12216443 is 34461221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12216443 - 2² = 12216439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12216403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3413 + ... + 6006.

It is an arithmetic number, because the mean of its divisors is an integer number (3056790).

Almost surely, 2^12216443 is an apocalyptic number.

12216443 is a deficient number, since it is larger than the sum of its proper divisors (10717).

12216443 is an equidigital number, since it uses as much as digits as its factorization.

12216443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10716.

The product of its digits is 1152, while the sum is 23.

The square root of 12216443 is about 3495.2028553433. The cubic root of 12216443 is about 230.3111290296.

Adding to 12216443 its reverse (34461221), we get a palindrome (46677664).

The spelling of 12216443 in words is "twelve million, two hundred sixteen thousand, four hundred forty-three".