12112221110021 has 4 divisors (see below), whose sum is σ = 12112525990092. Its totient is φ = 12111916229952.

The previous prime is 12112221109973. The next prime is 12112221110081. The reversal of 12112221110021 is 12001112221121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9419307289921 + 2692913820100 = 3069089^2 + 1641010^2 .

It is a cyclic number.

It is not a de Polignac number, because 12112221110021 - 2³⁰ = 12111147368197 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 (12112221110081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152380436 + ... + 152459901.

It is an arithmetic number, because the mean of its divisors is an integer number (3028131497523).

Almost surely, 2^{12112221110021} is an apocalyptic number.

It is an amenable number.

12112221110021 is a deficient number, since it is larger than the sum of its proper divisors (304880071).

12112221110021 is an equidigital number, since it uses as much as digits as its factorization.

12112221110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304880070.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 12112221110021 its reverse (12001112221121), we get a palindrome (24113333331142).

Subtracting from 12112221110021 its reverse (12001112221121), we obtain a square (111108888900 = 333330²).

The spelling of 12112221110021 in words is "twelve trillion, one hundred twelve billion, two hundred twenty-one million, one hundred ten thousand, twenty-one".