12131230321 has 6 divisors (see below), whose sum is σ = 14111839410. Its totient is φ = 10398197376.

The previous prime is 12131230289. The next prime is 12131230327. The reversal of 12131230321 is 12303213121.

12131230321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 10627341921 + 1503888400 = 103089^2 + 38780^2 .

It is not a de Polignac number, because 12131230321 - 2⁵ = 12131230289 is a prime.

It is a super-2 number, since 2×12131230321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12131230327) 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 5 ways as a sum of consecutive naturals, for example, 123788016 + ... + 123788113.

It is an arithmetic number, because the mean of its divisors is an integer number (2351973235).

Almost surely, 2^12131230321 is an apocalyptic number.

It is an amenable number.

12131230321 is a deficient number, since it is larger than the sum of its proper divisors (1980609089).

12131230321 is an equidigital number, since it uses as much as digits as its factorization.

12131230321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247576143 (or 247576136 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 12131230321 its reverse (12303213121), we get a palindrome (24434443442).

The spelling of 12131230321 in words is "twelve billion, one hundred thirty-one million, two hundred thirty thousand, three hundred twenty-one".