12112012121 has 4 divisors (see below), whose sum is σ = 13213104144. Its totient is φ = 11010920100.

The previous prime is 12112012067. The next prime is 12112012177. The reversal of 12112012121 is 12121021121.

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 a cyclic number.

It is not a de Polignac number, because 12112012121 - 2¹⁴ = 12111995737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12112012096 and 12112012105.

It is not an unprimeable number, because it can be changed into a prime (12115012121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550545995 + ... + 550546016.

It is an arithmetic number, because the mean of its divisors is an integer number (3303276036).

Almost surely, 2^12112012121 is an apocalyptic number.

12112012121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12112012121 is a deficient number, since it is larger than the sum of its proper divisors (1101092023).

12112012121 is a wasteful number, since it uses less digits than its factorization.

12112012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101092022.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12112012121 its reverse (12121021121), we get a palindrome (24233033242).

The spelling of 12112012121 in words is "twelve billion, one hundred twelve million, twelve thousand, one hundred twenty-one".