12421242 has 64 divisors (see below), whose sum is σ = 29410560. Its totient is φ = 3877632.

The previous prime is 12421229. The next prime is 12421243. The reversal of 12421242 is 24212421.

12421242 is a `hidden beast` number, since 1 + 2 + 421 + 242 = 666.

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

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (12421243) 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 in 31 ways as a sum of consecutive naturals, for example, 90598 + ... + 90734.

It is an arithmetic number, because the mean of its divisors is an integer number (459540).

Almost surely, 2^12421242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12421242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14705280).

12421242 is an abundant number, since it is smaller than the sum of its proper divisors (16989318).

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

12421242 is a wasteful number, since it uses less digits than its factorization.

12421242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244 (or 238 counting only the distinct ones).

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

The square root of 12421242 is about 3524.3782430381. The cubic root of 12421242 is about 231.5909980662.

Adding to 12421242 its reverse (24212421), we get a palindrome (36633663).

The spelling of 12421242 in words is "twelve million, four hundred twenty-one thousand, two hundred forty-two".