12112424221 has 4 divisors (see below), whose sum is σ = 12407849244. Its totient is φ = 11816999200.

The previous prime is 12112424183. The next prime is 12112424227. The reversal of 12112424221 is 12242421121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4718316100 + 7394108121 = 68690^2 + 85989^2 .

It is a cyclic number.

It is not a de Polignac number, because 12112424221 - 2²³ = 12104035613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12112424192 and 12112424201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112424227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147712450 + ... + 147712531.

It is an arithmetic number, because the mean of its divisors is an integer number (3101962311).

Almost surely, 2^12112424221 is an apocalyptic number.

It is an amenable number.

12112424221 is a deficient number, since it is larger than the sum of its proper divisors (295425023).

12112424221 is an equidigital number, since it uses as much as digits as its factorization.

12112424221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295425022.

The product of its digits is 512, while the sum is 22.

Adding to 12112424221 its reverse (12242421121), we get a palindrome (24354845342).

The spelling of 12112424221 in words is "twelve billion, one hundred twelve million, four hundred twenty-four thousand, two hundred twenty-one".