12120221121 has 4 divisors (see below), whose sum is σ = 16160294832. Its totient is φ = 8080147412.

The previous prime is 12120221117. The next prime is 12120221123. The reversal of 12120221121 is 12112202121.

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 12120221121 - 2² = 12120221117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12120221121.

It is not an unprimeable number, because it can be changed into a prime (12120221123) 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, 2020036851 + ... + 2020036856.

It is an arithmetic number, because the mean of its divisors is an integer number (4040073708).

Almost surely, 2^12120221121 is an apocalyptic number.

It is an amenable number.

12120221121 is a deficient number, since it is larger than the sum of its proper divisors (4040073711).

12120221121 is an equidigital number, since it uses as much as digits as its factorization.

12120221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040073710.

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

Adding to 12120221121 its reverse (12112202121), we get a palindrome (24232423242).

The spelling of 12120221121 in words is "twelve billion, one hundred twenty million, two hundred twenty-one thousand, one hundred twenty-one".