12112221111221 has 8 divisors (see below), whose sum is σ = 15100950995904. Its totient is φ = 9438094372320.

The previous prime is 12112221111161. The next prime is 12112221111229. The reversal of 12112221111221 is 12211112221121.

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 12112221111221 - 2²⁶ = 12112154002357 is a prime.

It is a super-2 number, since 2×12112221111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12112221111193 and 12112221111202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112221111229) 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 7 ways as a sum of consecutive naturals, for example, 78650786360 + ... + 78650786513.

It is an arithmetic number, because the mean of its divisors is an integer number (1887618874488).

Almost surely, 2^{12112221111221} is an apocalyptic number.

12112221111221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12112221111221 is a deficient number, since it is larger than the sum of its proper divisors (2988729884683).

12112221111221 is a wasteful number, since it uses less digits than its factorization.

12112221111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157301572891.

The product of its digits is 64, while the sum is 20.

Adding to 12112221111221 its reverse (12211112221121), we get a palindrome (24323333332342).

The spelling of 12112221111221 in words is "twelve trillion, one hundred twelve billion, two hundred twenty-one million, one hundred eleven thousand, two hundred twenty-one".