12012311321 has 2 divisors, whose sum is σ = 12012311322. Its totient is φ = 12012311320.

The previous prime is 12012311291. The next prime is 12012311329. The reversal of 12012311321 is 12311321021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12012160000 + 151321 = 109600^2 + 389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12012311321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12012311321.

It is not a weakly prime, because it can be changed into another prime (12012311329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006155660 + 6006155661.

It is an arithmetic number, because the mean of its divisors is an integer number (6006155661).

Almost surely, 2^12012311321 is an apocalyptic number.

It is an amenable number.

12012311321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12012311321 is an equidigital number, since it uses as much as digits as its factorization.

12012311321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 12012311321 its reverse (12311321021), we get a palindrome (24323632342).

The spelling of 12012311321 in words is "twelve billion, twelve million, three hundred eleven thousand, three hundred twenty-one".