12112110221221 has 8 divisors (see below), whose sum is σ = 12224238401880. Its totient is φ = 12000068731392.

The previous prime is 12112110221131. The next prime is 12112110221261. The reversal of 12112110221221 is 12212201121121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 53430322500 + 12058679898721 = 231150^2 + 3472561^2 .

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 12112110221221 - 2¹¹ = 12112110219173 is a prime.

It is a super-2 number, since 2×12112110221221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112110221261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21391966 + ... + 21950863.

It is an arithmetic number, because the mean of its divisors is an integer number (1528029800235).

Almost surely, 2^{12112110221221} is an apocalyptic number.

It is an amenable number.

12112110221221 is a deficient number, since it is larger than the sum of its proper divisors (112128180659).

12112110221221 is a wasteful number, since it uses less digits than its factorization.

12112110221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43345415.

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

Adding to 12112110221221 its reverse (12212201121121), we get a palindrome (24324311342342).

The spelling of 12112110221221 in words is "twelve trillion, one hundred twelve billion, one hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".