12242121 has 4 divisors (see below), whose sum is σ = 16322832. Its totient is φ = 8161412.

The previous prime is 12242107. The next prime is 12242123. The reversal of 12242121 is 12124221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12124221 = 3 ⋅4041407.

It is a cyclic number.

It is not a de Polignac number, because 12242121 - 2¹¹ = 12240073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12242121.

It is not an unprimeable number, because it can be changed into a prime (12242123) 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 3 ways as a sum of consecutive naturals, for example, 2040351 + ... + 2040356.

It is an arithmetic number, because the mean of its divisors is an integer number (4080708).

Almost surely, 2^12242121 is an apocalyptic number.

It is an amenable number.

12242121 is a deficient number, since it is larger than the sum of its proper divisors (4080711).

12242121 is an equidigital number, since it uses as much as digits as its factorization.

12242121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4080710.

The product of its digits is 64, while the sum is 15.

The square root of 12242121 is about 3498.8742475259. The cubic root of 12242121 is about 230.4723813807.

Adding to 12242121 its reverse (12124221), we get a palindrome (24366342).

The spelling of 12242121 in words is "twelve million, two hundred forty-two thousand, one hundred twenty-one".