12211442 has 4 divisors (see below), whose sum is σ = 18317166. Its totient is φ = 6105720.

The previous prime is 12211421. The next prime is 12211447. The reversal of 12211442 is 24411221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24411221 = 239 ⋅102139.

It can be written as a sum of positive squares in only one way, i.e., 10106041 + 2105401 = 3179^2 + 1451^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12211442.

It is not an unprimeable number, because it can be changed into a prime (12211447) by changing a digit.

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 as a sum of consecutive naturals, namely, 3052859 + ... + 3052862.

Almost surely, 2^12211442 is an apocalyptic number.

12211442 is a deficient number, since it is larger than the sum of its proper divisors (6105724).

12211442 is an equidigital number, since it uses as much as digits as its factorization.

12211442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6105723.

The product of its digits is 128, while the sum is 17.

The square root of 12211442 is about 3494.4873729919. The cubic root of 12211442 is about 230.2796975358.

Adding to 12211442 its reverse (24411221), we get a palindrome (36622663).

The spelling of 12211442 in words is "twelve million, two hundred eleven thousand, four hundred forty-two".