12112121222121 has 4 divisors (see below), whose sum is σ = 16149494962832. Its totient is φ = 8074747481412.

The previous prime is 12112121222101. The next prime is 12112121222129. The reversal of 12112121222121 is 12122212121121.

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 12112121222121 - 2²¹ = 12112119124969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12112121222129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2018686870351 + ... + 2018686870356.

It is an arithmetic number, because the mean of its divisors is an integer number (4037373740708).

Almost surely, 2^{12112121222121} is an apocalyptic number.

It is an amenable number.

12112121222121 is a deficient number, since it is larger than the sum of its proper divisors (4037373740711).

12112121222121 is an equidigital number, since it uses as much as digits as its factorization.

12112121222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4037373740710.

The product of its digits is 128, while the sum is 21.

Adding to 12112121222121 its reverse (12122212121121), we get a palindrome (24234333343242).

The spelling of 12112121222121 in words is "twelve trillion, one hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".