12001321001 has 2 divisors, whose sum is σ = 12001321002. Its totient is φ = 12001321000.

The previous prime is 12001320983. The next prime is 12001321097. The reversal of 12001321001 is 10012310021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9158298601 + 2843022400 = 95699^2 + 53320^2 .

It is a cyclic number.

It is not a de Polignac number, because 12001321001 - 2³⁰ = 10927579177 is a prime.

It is not a weakly prime, because it can be changed into another prime (12001321201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6000660500 + 6000660501.

It is an arithmetic number, because the mean of its divisors is an integer number (6000660501).

Almost surely, 2^12001321001 is an apocalyptic number.

It is an amenable number.

12001321001 is a deficient number, since it is larger than the sum of its proper divisors (1).

12001321001 is an equidigital number, since it uses as much as digits as its factorization.

12001321001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 12001321001 its reverse (10012310021), we get a palindrome (22013631022).

The spelling of 12001321001 in words is "twelve billion, one million, three hundred twenty-one thousand, one".