21200210103817 has 2 divisors, whose sum is σ = 21200210103818. Its totient is φ = 21200210103816.

The previous prime is 21200210103703. The next prime is 21200210103827. The reversal of 21200210103817 is 71830101200212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17445958970896 + 3754251132921 = 4176836^2 + 1937589^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200210103817 - 2¹⁵ = 21200210071049 is a prime.

It is not a weakly prime, because it can be changed into another prime (21200210103827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600105051908 + 10600105051909.

It is an arithmetic number, because the mean of its divisors is an integer number (10600105051909).

Almost surely, 2^{21200210103817} is an apocalyptic number.

It is an amenable number.

21200210103817 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200210103817 is an equidigital number, since it uses as much as digits as its factorization.

21200210103817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 28.

The spelling of 21200210103817 in words is "twenty-one trillion, two hundred billion, two hundred ten million, one hundred three thousand, eight hundred seventeen".