12112223321221 has 4 divisors (see below), whose sum is σ = 12749708759200. Its totient is φ = 11474737883244.

The previous prime is 12112223321197. The next prime is 12112223321251. The reversal of 12112223321221 is 12212332221121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12112223321221 - 2¹⁵ = 12112223288453 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 (12112223321251) 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 3 ways as a sum of consecutive naturals, for example, 318742718961 + ... + 318742718998.

It is an arithmetic number, because the mean of its divisors is an integer number (3187427189800).

Almost surely, 2^{12112223321221} is an apocalyptic number.

It is an amenable number.

12112223321221 is a deficient number, since it is larger than the sum of its proper divisors (637485437979).

12112223321221 is an equidigital number, since it uses as much as digits as its factorization.

12112223321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637485437978.

The product of its digits is 1152, while the sum is 25.

Adding to 12112223321221 its reverse (12212332221121), we get a palindrome (24324555542342).

The spelling of 12112223321221 in words is "twelve trillion, one hundred twelve billion, two hundred twenty-three million, three hundred twenty-one thousand, two hundred twenty-one".