12218042 has 4 divisors (see below), whose sum is σ = 18327066. Its totient is φ = 6109020.

The previous prime is 12218033. The next prime is 12218051. The reversal of 12218042 is 24081221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (12218033) and next prime (12218051).

It can be written as a sum of positive squares in only one way, i.e., 9186961 + 3031081 = 3031^2 + 1741^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3054509 + ... + 3054512.

Almost surely, 2^12218042 is an apocalyptic number.

12218042 is a deficient number, since it is larger than the sum of its proper divisors (6109024).

12218042 is an equidigital number, since it uses as much as digits as its factorization.

12218042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6109023.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 12218042 is about 3495.4315899471. The cubic root of 12218042 is about 230.3211770016.

Adding to 12218042 its reverse (24081221), we get a palindrome (36299263).

The spelling of 12218042 in words is "twelve million, two hundred eighteen thousand, forty-two".