12013012321 has 2 divisors, whose sum is σ = 12013012322. Its totient is φ = 12013012320.

The previous prime is 12013012273. The next prime is 12013012343. The reversal of 12013012321 is 12321031021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11938621696 + 74390625 = 109264^2 + 8625^2 .

It is a cyclic number.

It is not a de Polignac number, because 12013012321 - 2²⁷ = 11878794593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12013012295 and 12013012304.

It is not a weakly prime, because it can be changed into another prime (12013012721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006506160 + 6006506161.

It is an arithmetic number, because the mean of its divisors is an integer number (6006506161).

Almost surely, 2^12013012321 is an apocalyptic number.

It is an amenable number.

12013012321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12013012321 is an equidigital number, since it uses as much as digits as its factorization.

12013012321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 12013012321 its reverse (12321031021), we get a palindrome (24334043342).

The spelling of 12013012321 in words is "twelve billion, thirteen million, twelve thousand, three hundred twenty-one".