12112121100 has 36 divisors (see below), whose sum is σ = 35044404584. Its totient is φ = 3229898880.

The previous prime is 12112121089. The next prime is 12112121101. The reversal of 12112121100 is 112121121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (12112121101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20186569 + ... + 20187168.

Almost surely, 2^12112121100 is an apocalyptic number.

12112121100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12112121100 is an abundant number, since it is smaller than the sum of its proper divisors (22932283484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12112121100 is a wasteful number, since it uses less digits than its factorization.

12112121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40373754 (or 40373747 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 12112121100 its reverse (112121121), we get a palindrome (12224242221).

The spelling of 12112121100 in words is "twelve billion, one hundred twelve million, one hundred twenty-one thousand, one hundred".