21110010205717 has 2 divisors, whose sum is σ = 21110010205718. Its totient is φ = 21110010205716.

The previous prime is 21110010205703. The next prime is 21110010205733. The reversal of 21110010205717 is 71750201001112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17541572086756 + 3568438118961 = 4188266^2 + 1889031^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110010205717 - 2¹¹ = 21110010203669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110010905717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555005102858 + 10555005102859.

It is an arithmetic number, because the mean of its divisors is an integer number (10555005102859).

Almost surely, 2^{21110010205717} is an apocalyptic number.

It is an amenable number.

21110010205717 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110010205717 is an equidigital number, since it uses as much as digits as its factorization.

21110010205717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 980, while the sum is 28.

Adding to 21110010205717 its reverse (71750201001112), we get a palindrome (92860211206829).

The spelling of 21110010205717 in words is "twenty-one trillion, one hundred ten billion, ten million, two hundred five thousand, seven hundred seventeen".