12221442 has 24 divisors (see below), whose sum is σ = 27461616. Its totient is φ = 4073652.

The previous prime is 12221431. The next prime is 12221449. The reversal of 12221442 is 24412221.

12221442 is a `hidden beast` number, since 1 + 2 + 221 + 442 = 666.

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 (12221449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12088 + ... + 13059.

It is an arithmetic number, because the mean of its divisors is an integer number (1144234).

Almost surely, 2^12221442 is an apocalyptic number.

12221442 is an abundant number, since it is smaller than the sum of its proper divisors (15240174).

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

12221442 is an equidigital number, since it uses as much as digits as its factorization.

12221442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25164 (or 25152 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 12221442 is about 3495.9179052146. The cubic root of 12221442 is about 230.3425393817.

Adding to 12221442 its reverse (24412221), we get a palindrome (36633663).

The spelling of 12221442 in words is "twelve million, two hundred twenty-one thousand, four hundred forty-two".