12112220221 has 8 divisors (see below), whose sum is σ = 12514569984. Its totient is φ = 11716308240.

The previous prime is 12112220191. The next prime is 12112220249. The reversal of 12112220221 is 12202221121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12112220221 - 2⁹ = 12112219709 is a prime.

It is a super-4 number, since 4×12112220221⁴ (a number of 41 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12112220195 and 12112220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112220261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1605621 + ... + 1613146.

It is an arithmetic number, because the mean of its divisors is an integer number (1564321248).

Almost surely, 2^12112220221 is an apocalyptic number.

It is an amenable number.

12112220221 is a deficient number, since it is larger than the sum of its proper divisors (402349763).

12112220221 is an equidigital number, since it uses as much as digits as its factorization.

12112220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3218891.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12112220221 its reverse (12202221121), we get a palindrome (24314441342).

The spelling of 12112220221 in words is "twelve billion, one hundred twelve million, two hundred twenty thousand, two hundred twenty-one".