12112121211 has 8 divisors (see below), whose sum is σ = 16220017680. Its totient is φ = 8039486112.

The previous prime is 12112121201. The next prime is 12112121221. The reversal of 12112121211 is 11212121121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12112121201) and next prime (12112121221).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12112121211 - 2¹⁰ = 12112120187 is a prime.

It is a super-4 number, since 4×12112121211⁴ (a number of 41 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (12112121201) 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 7 ways as a sum of consecutive naturals, for example, 8814540 + ... + 8815913.

It is an arithmetic number, because the mean of its divisors is an integer number (2027502210).

Almost surely, 2^12112121211 is an apocalyptic number.

12112121211 is a deficient number, since it is larger than the sum of its proper divisors (4107896469).

12112121211 is a wasteful number, since it uses less digits than its factorization.

12112121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17630685.

The product of its digits is 16, while the sum is 15.

Adding to 12112121211 its reverse (11212121121), we get a palindrome (23324242332).

The spelling of 12112121211 in words is "twelve billion, one hundred twelve million, one hundred twenty-one thousand, two hundred eleven".