12112110021 has 16 divisors (see below), whose sum is σ = 17735860800. Its totient is φ = 7291403520.

The previous prime is 12112110013. The next prime is 12112110047. The reversal of 12112110021 is 12001121121.

It is not a de Polignac number, because 12112110021 - 2³ = 12112110013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12112109979 and 12112110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112110061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1226740 + ... + 1236573.

It is an arithmetic number, because the mean of its divisors is an integer number (1108491300).

Almost surely, 2^12112110021 is an apocalyptic number.

12112110021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12112110021 is a deficient number, since it is larger than the sum of its proper divisors (5623750779).

12112110021 is a wasteful number, since it uses less digits than its factorization.

12112110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2463476.

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

Adding to 12112110021 its reverse (12001121121), we get a palindrome (24113231142).

It can be divided in two parts, 121121100 and 21, that added together give a palindrome (121121121).

The spelling of 12112110021 in words is "twelve billion, one hundred twelve million, one hundred ten thousand, twenty-one".