12112222011221 has 2 divisors, whose sum is σ = 12112222011222. Its totient is φ = 12112222011220.

The previous prime is 12112222011167. The next prime is 12112222011233. The reversal of 12112222011221 is 12211022221121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7965659522500 + 4146562488721 = 2822350^2 + 2036311^2 .

It is a cyclic number.

It is not a de Polignac number, because 12112222011221 - 2¹⁰ = 12112222010197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12112222011193 and 12112222011202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12112222011271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6056111005610 + 6056111005611.

It is an arithmetic number, because the mean of its divisors is an integer number (6056111005611).

Almost surely, 2^{12112222011221} is an apocalyptic number.

It is an amenable number.

12112222011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12112222011221 is an equidigital number, since it uses as much as digits as its factorization.

12112222011221 is an evil number, because the sum of its binary digits is even.

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

Adding to 12112222011221 its reverse (12211022221121), we get a palindrome (24323244232342).

The spelling of 12112222011221 in words is "twelve trillion, one hundred twelve billion, two hundred twenty-two million, eleven thousand, two hundred twenty-one".