12112212221 has 8 divisors (see below), whose sum is σ = 12371958144. Its totient is φ = 11852551360.

The previous prime is 12112212197. The next prime is 12112212223. The reversal of 12112212221 is 12221221121.

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 12112212221 - 2³⁰ = 11038470397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12112212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112212223) 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, 326981 + ... + 362133.

It is an arithmetic number, because the mean of its divisors is an integer number (1546494768).

Almost surely, 2^12112212221 is an apocalyptic number.

It is an amenable number.

12112212221 is a deficient number, since it is larger than the sum of its proper divisors (259745923).

12112212221 is an equidigital number, since it uses as much as digits as its factorization.

12112212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42531.

The product of its digits is 64, while the sum is 17.

Adding to 12112212221 its reverse (12221221121), we get a palindrome (24333433342).

The spelling of 12112212221 in words is "twelve billion, one hundred twelve million, two hundred twelve thousand, two hundred twenty-one".