12112212011221 has 24 divisors (see below), whose sum is σ = 14707641381120. Its totient is φ = 9934108430400.

The previous prime is 12112212011201. The next prime is 12112212011231. The reversal of 12112212011221 is 12211021221121.

It is a happy number.

It is not a de Polignac number, because 12112212011221 - 2¹⁹ = 12112211486933 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 (12112212011201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44661475 + ... + 44931856.

It is an arithmetic number, because the mean of its divisors is an integer number (612818390880).

Almost surely, 2^{12112212011221} is an apocalyptic number.

It is an amenable number.

12112212011221 is a deficient number, since it is larger than the sum of its proper divisors (2595429369899).

12112212011221 is an equidigital number, since it uses as much as digits as its factorization.

12112212011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89593465 (or 89593458 counting only the distinct ones).

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

Adding to 12112212011221 its reverse (12211021221121), we get a palindrome (24323233232342).

The spelling of 12112212011221 in words is "twelve trillion, one hundred twelve billion, two hundred twelve million, eleven thousand, two hundred twenty-one".