10001231321 has 2 divisors, whose sum is σ = 10001231322. Its totient is φ = 10001231320.

The previous prime is 10001231263. The next prime is 10001231327. The reversal of 10001231321 is 12313210001.

10001231321 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6571372096 + 3429859225 = 81064^2 + 58565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10001231321 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10001231296 and 10001231305.

It is not a weakly prime, because it can be changed into another prime (10001231327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000615660 + 5000615661.

It is an arithmetic number, because the mean of its divisors is an integer number (5000615661).

Almost surely, 2^10001231321 is an apocalyptic number.

It is an amenable number.

10001231321 is a deficient number, since it is larger than the sum of its proper divisors (1).

10001231321 is an equidigital number, since it uses as much as digits as its factorization.

10001231321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 10001231321 its reverse (12313210001), we get a palindrome (22314441322).

It can be divided in two parts, 1000 and 1231321, that added together give a palindrome (1232321).

The spelling of 10001231321 in words is "ten billion, one million, two hundred thirty-one thousand, three hundred twenty-one".