21004203200317 has 2 divisors, whose sum is σ = 21004203200318. Its totient is φ = 21004203200316.

The previous prime is 21004203200273. The next prime is 21004203200339. The reversal of 21004203200317 is 71300230240012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15073487886681 + 5930715313636 = 3882459^2 + 2435306^2 .

It is a cyclic number.

It is not a de Polignac number, because 21004203200317 - 2³⁵ = 20969843461949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21004203200291 and 21004203200300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21004203200417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10502101600158 + 10502101600159.

It is an arithmetic number, because the mean of its divisors is an integer number (10502101600159).

Almost surely, 2^{21004203200317} is an apocalyptic number.

It is an amenable number.

21004203200317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21004203200317 is an equidigital number, since it uses as much as digits as its factorization.

21004203200317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 25.

Adding to 21004203200317 its reverse (71300230240012), we get a palindrome (92304433440329).

The spelling of 21004203200317 in words is "twenty-one trillion, four billion, two hundred three million, two hundred thousand, three hundred seventeen".