12121442 has 16 divisors (see below), whose sum is σ = 19701792. Its totient is φ = 5570880.

The previous prime is 12121427. The next prime is 12121451. The reversal of 12121442 is 24412121.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 12121442.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2684 + ... + 5607.

It is an arithmetic number, because the mean of its divisors is an integer number (1231362).

Almost surely, 2^12121442 is an apocalyptic number.

12121442 is a deficient number, since it is larger than the sum of its proper divisors (7580350).

12121442 is a wasteful number, since it uses less digits than its factorization.

12121442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8353.

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

The square root of 12121442 is about 3481.5861327849. The cubic root of 12121442 is about 229.7125710088.

Adding to 12121442 its reverse (24412121), we get a palindrome (36533563).

The spelling of 12121442 in words is "twelve million, one hundred twenty-one thousand, four hundred forty-two".