12112101122221 has 4 divisors (see below), whose sum is σ = 12112115603872. Its totient is φ = 12112086640572.

The previous prime is 12112101122201. The next prime is 12112101122257. The reversal of 12112101122221 is 12222110121121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12112101122221 - 2¹⁷ = 12112100991149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112101122201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5903991 + ... + 7686436.

It is an arithmetic number, because the mean of its divisors is an integer number (3028028900968).

Almost surely, 2^{12112101122221} is an apocalyptic number.

It is an amenable number.

12112101122221 is a deficient number, since it is larger than the sum of its proper divisors (14481651).

12112101122221 is an equidigital number, since it uses as much as digits as its factorization.

12112101122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14481650.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12112101122221 its reverse (12222110121121), we get a palindrome (24334211243342).

The spelling of 12112101122221 in words is "twelve trillion, one hundred twelve billion, one hundred one million, one hundred twenty-two thousand, two hundred twenty-one".