21321210203317 has 2 divisors, whose sum is σ = 21321210203318. Its totient is φ = 21321210203316.

The previous prime is 21321210203303. The next prime is 21321210203323. The reversal of 21321210203317 is 71330201212312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21006400559076 + 314809644241 = 4583274^2 + 561079^2 .

It is a cyclic number.

It is not a de Polignac number, because 21321210203317 - 2²³ = 21321201814709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21321210207317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660605101658 + 10660605101659.

It is an arithmetic number, because the mean of its divisors is an integer number (10660605101659).

Almost surely, 2^{21321210203317} is an apocalyptic number.

It is an amenable number.

21321210203317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321210203317 is an equidigital number, since it uses as much as digits as its factorization.

21321210203317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

Adding to 21321210203317 its reverse (71330201212312), we get a palindrome (92651411415629).

The spelling of 21321210203317 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred ten million, two hundred three thousand, three hundred seventeen".