12112220121221 has 16 divisors (see below), whose sum is σ = 13221894237120. Its totient is φ = 11003974567680.

The previous prime is 12112220121187. The next prime is 12112220121223. The reversal of 12112220121221 is 12212102221121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12112220121221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12112220121193 and 12112220121202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112220121223) 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 15 ways as a sum of consecutive naturals, for example, 217438445 + ... + 217494141.

It is an arithmetic number, because the mean of its divisors is an integer number (826368389820).

Almost surely, 2^{12112220121221} is an apocalyptic number.

12112220121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12112220121221 is a deficient number, since it is larger than the sum of its proper divisors (1109674115899).

12112220121221 is a wasteful number, since it uses less digits than its factorization.

12112220121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68164.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 12112220121221 its reverse (12212102221121), we get a palindrome (24324322342342).

The spelling of 12112220121221 in words is "twelve trillion, one hundred twelve billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty-one".