21210000010217 has 2 divisors, whose sum is σ = 21210000010218. Its totient is φ = 21210000010216.

The previous prime is 21210000010181. The next prime is 21210000010313. The reversal of 21210000010217 is 71201000001212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18312613896976 + 2897386113241 = 4279324^2 + 1702171^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210000010217 - 2³⁶ = 21141280533481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21210000010195 and 21210000010204.

It is not a weakly prime, because it can be changed into another prime (21210000010417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605000005108 + 10605000005109.

It is an arithmetic number, because the mean of its divisors is an integer number (10605000005109).

Almost surely, 2^{21210000010217} is an apocalyptic number.

It is an amenable number.

21210000010217 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210000010217 is an equidigital number, since it uses as much as digits as its factorization.

21210000010217 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 17.

Adding to 21210000010217 its reverse (71201000001212), we get a palindrome (92411000011429).

The spelling of 21210000010217 in words is "twenty-one trillion, two hundred ten billion, ten thousand, two hundred seventeen".