12216042 has 32 divisors (see below), whose sum is σ = 27783360. Its totient is φ = 3976560.

The previous prime is 12216041. The next prime is 12216079. The reversal of 12216042 is 24061221.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (12216041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309 + ... + 4952.

It is an arithmetic number, because the mean of its divisors is an integer number (868230).

Almost surely, 2^12216042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12216042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13891680).

12216042 is an abundant number, since it is smaller than the sum of its proper divisors (15567318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12216042 is a wasteful number, since it uses less digits than its factorization.

12216042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5315 (or 5309 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 12216042 is about 3495.1454905340. The cubic root of 12216042 is about 230.3086090443.

Adding to 12216042 its reverse (24061221), we get a palindrome (36277263).

The spelling of 12216042 in words is "twelve million, two hundred sixteen thousand, forty-two".