12112021122221 has 4 divisors (see below), whose sum is σ = 12118746288444. Its totient is φ = 12105295956000.

The previous prime is 12112021122193. The next prime is 12112021122259. The reversal of 12112021122221 is 12222112021121.

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 6308687124100 + 5803333998121 = 2511710^2 + 2409011^2 .

It is a cyclic number.

It is not a de Polignac number, because 12112021122221 - 2¹⁰ = 12112021121197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12112021122193 and 12112021122202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112021122281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3362580410 + ... + 3362584011.

It is an arithmetic number, because the mean of its divisors is an integer number (3029686572111).

Almost surely, 2^{12112021122221} is an apocalyptic number.

It is an amenable number.

12112021122221 is a deficient number, since it is larger than the sum of its proper divisors (6725166223).

12112021122221 is an equidigital number, since it uses as much as digits as its factorization.

12112021122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6725166222.

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

Adding to 12112021122221 its reverse (12222112021121), we get a palindrome (24334133143342).

The spelling of 12112021122221 in words is "twelve trillion, one hundred twelve billion, twenty-one million, one hundred twenty-two thousand, two hundred twenty-one".