12216442 has 16 divisors (see below), whose sum is σ = 21454272. Its totient is φ = 5107680.

The previous prime is 12216439. The next prime is 12216493. The reversal of 12216442 is 24461221.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 10068 + ... + 11215.

It is an arithmetic number, because the mean of its divisors is an integer number (1340892).

Almost surely, 2^12216442 is an apocalyptic number.

12216442 is a deficient number, since it is larger than the sum of its proper divisors (9237830).

12216442 is a wasteful number, since it uses less digits than its factorization.

12216442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21333.

The product of its digits is 768, while the sum is 22.

The square root of 12216442 is about 3495.2027122901. The cubic root of 12216442 is about 230.3111227455.

Adding to 12216442 its reverse (24461221), we get a palindrome (36677663).

The spelling of 12216442 in words is "twelve million, two hundred sixteen thousand, four hundred forty-two".