12112121 has 4 divisors (see below), whose sum is σ = 13842432. Its totient is φ = 10381812.

The previous prime is 12112069. The next prime is 12112127. The reversal of 12112121 is 12121121.

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.

It is not a de Polignac number, because 12112121 - 2⁶ = 12112057 is a prime.

It is a Duffinian number.

12112121 is a modest number, since divided by 2121 gives 1211 as remainder.

It is not an unprimeable number, because it can be changed into a prime (12112127) 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, 865145 + ... + 865158.

It is an arithmetic number, because the mean of its divisors is an integer number (3460608).

Almost surely, 2^12112121 is an apocalyptic number.

It is an amenable number.

12112121 is a deficient number, since it is larger than the sum of its proper divisors (1730311).

12112121 is an equidigital number, since it uses as much as digits as its factorization.

12112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730310.

The product of its digits is 8, while the sum is 11.

The square root of 12112121 is about 3480.2472613307. The cubic root of 12112121 is about 229.6536753776.

Adding to 12112121 its reverse (12121121), we get a palindrome (24233242).

It can be divided in two parts, 121 and 12121, that multiplied together give a palindrome (1466641).

The spelling of 12112121 in words is "twelve million, one hundred twelve thousand, one hundred twenty-one".