21102200017 has 2 divisors, whose sum is σ = 21102200018. Its totient is φ = 21102200016.

The previous prime is 21102199997. The next prime is 21102200027. The reversal of 21102200017 is 71000220112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12731962896 + 8370237121 = 112836^2 + 91489^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102200017 - 2¹¹ = 21102197969 is a prime.

It is not a weakly prime, because it can be changed into another prime (21102200027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551100008 + 10551100009.

It is an arithmetic number, because the mean of its divisors is an integer number (10551100009).

Almost surely, 2^21102200017 is an apocalyptic number.

It is an amenable number.

21102200017 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102200017 is an equidigital number, since it uses as much as digits as its factorization.

21102200017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 16.

Adding to 21102200017 its reverse (71000220112), we get a palindrome (92102420129).

The spelling of 21102200017 in words is "twenty-one billion, one hundred two million, two hundred thousand, seventeen".