12121223321 has 4 divisors (see below), whose sum is σ = 12121737012. Its totient is φ = 12120709632.

The previous prime is 12121223291. The next prime is 12121223357. The reversal of 12121223321 is 12332212121.

12121223321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 6203767696 + 5917455625 = 78764^2 + 76925^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121223321 - 2¹⁰ = 12121222297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121223293 and 12121223302.

It is not an unprimeable number, because it can be changed into a prime (12121223381) 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, 219656 + ... + 269241.

It is an arithmetic number, because the mean of its divisors is an integer number (3030434253).

Almost surely, 2^12121223321 is an apocalyptic number.

It is an amenable number.

12121223321 is a deficient number, since it is larger than the sum of its proper divisors (513691).

12121223321 is an equidigital number, since it uses as much as digits as its factorization.

12121223321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513690.

The product of its digits is 288, while the sum is 20.

Adding to 12121223321 its reverse (12332212121), we get a palindrome (24453435442).

The spelling of 12121223321 in words is "twelve billion, one hundred twenty-one million, two hundred twenty-three thousand, three hundred twenty-one".