12112131220 has 48 divisors (see below), whose sum is σ = 29081727360. Its totient is φ = 4150929024.

The previous prime is 12112131173. The next prime is 12112131257. The reversal of 12112131220 is 2213121121.

It is a junction number, because it is equal to n+sod(n) for n = 12112131194 and 12112131203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 327846 + ... + 362914.

It is an arithmetic number, because the mean of its divisors is an integer number (605869320).

Almost surely, 2^12112131220 is an apocalyptic number.

12112131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12112131220 is an abundant number, since it is smaller than the sum of its proper divisors (16969596140).

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

12112131220 is a wasteful number, since it uses less digits than its factorization.

12112131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37552 (or 37550 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12112131220 its reverse (2213121121), we get a palindrome (14325252341).

The spelling of 12112131220 in words is "twelve billion, one hundred twelve million, one hundred thirty-one thousand, two hundred twenty".