21223231020317 has 2 divisors, whose sum is σ = 21223231020318. Its totient is φ = 21223231020316.

The previous prime is 21223231020311. The next prime is 21223231020361. The reversal of 21223231020317 is 71302013232212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21187369644676 + 35861375641 = 4602974^2 + 189371^2 .

It is a cyclic number.

It is not a de Polignac number, because 21223231020317 - 2⁴⁰ = 20123719392541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21223231020317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21223231020311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611615510158 + 10611615510159.

It is an arithmetic number, because the mean of its divisors is an integer number (10611615510159).

Almost surely, 2^{21223231020317} is an apocalyptic number.

It is an amenable number.

21223231020317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223231020317 is an equidigital number, since it uses as much as digits as its factorization.

21223231020317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

Adding to 21223231020317 its reverse (71302013232212), we get a palindrome (92525244252529).

The spelling of 21223231020317 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred thirty-one million, twenty thousand, three hundred seventeen".