12123133321 has 4 divisors (see below), whose sum is σ = 13055682052. Its totient is φ = 11190584592.

The previous prime is 12123133289. The next prime is 12123133333. The reversal of 12123133321 is 12333132121.

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 6498133321 + 5625000000 = 80611^2 + 75000^2 .

It is a cyclic number.

It is not a de Polignac number, because 12123133321 - 2⁵ = 12123133289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12123133292 and 12123133301.

It is not an unprimeable number, because it can be changed into a prime (12123133621) 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, 466274346 + ... + 466274371.

It is an arithmetic number, because the mean of its divisors is an integer number (3263920513).

Almost surely, 2^12123133321 is an apocalyptic number.

It is an amenable number.

12123133321 is a deficient number, since it is larger than the sum of its proper divisors (932548731).

12123133321 is an equidigital number, since it uses as much as digits as its factorization.

12123133321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932548730.

The product of its digits is 648, while the sum is 22.

Adding to 12123133321 its reverse (12333132121), we get a palindrome (24456265442).

The spelling of 12123133321 in words is "twelve billion, one hundred twenty-three million, one hundred thirty-three thousand, three hundred twenty-one".