20103431321 has 2 divisors, whose sum is σ = 20103431322. Its totient is φ = 20103431320.

The previous prime is 20103431303. The next prime is 20103431323. The reversal of 20103431321 is 12313430102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18841405696 + 1262025625 = 137264^2 + 35525^2 .

It is a cyclic number.

It is not a de Polignac number, because 20103431321 - 2¹⁰ = 20103430297 is a prime.

It is a Sophie Germain prime.

Together with 20103431323, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20103431293 and 20103431302.

It is not a weakly prime, because it can be changed into another prime (20103431323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051715660 + 10051715661.

It is an arithmetic number, because the mean of its divisors is an integer number (10051715661).

Almost surely, 2^20103431321 is an apocalyptic number.

It is an amenable number.

20103431321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20103431321 is an equidigital number, since it uses as much as digits as its factorization.

20103431321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 20103431321 its reverse (12313430102), we get a palindrome (32416861423).

The spelling of 20103431321 in words is "twenty billion, one hundred three million, four hundred thirty-one thousand, three hundred twenty-one".