12112221021 has 4 divisors (see below), whose sum is σ = 16149628032. Its totient is φ = 8074814012.

The previous prime is 12112220993. The next prime is 12112221029. The reversal of 12112221021 is 12012221121.

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 12112221021 - 2⁶ = 12112220957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112221029) 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, 2018703501 + ... + 2018703506.

It is an arithmetic number, because the mean of its divisors is an integer number (4037407008).

Almost surely, 2^12112221021 is an apocalyptic number.

It is an amenable number.

12112221021 is a deficient number, since it is larger than the sum of its proper divisors (4037407011).

12112221021 is an equidigital number, since it uses as much as digits as its factorization.

12112221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4037407010.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12112221021 its reverse (12012221121), we get a palindrome (24124442142).

The spelling of 12112221021 in words is "twelve billion, one hundred twelve million, two hundred twenty-one thousand, twenty-one".