210001010209 has 2 divisors, whose sum is σ = 210001010210. Its totient is φ = 210001010208.

The previous prime is 210001010207. The next prime is 210001010221. The reversal of 210001010209 is 902010100012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209126033809 + 874976400 = 457303^2 + 29580^2 .

It is a cyclic number.

It is not a de Polignac number, because 210001010209 - 2¹ = 210001010207 is a prime.

Together with 210001010207, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 210001010192 and 210001010201.

It is not a weakly prime, because it can be changed into another prime (210001010201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105000505104 + 105000505105.

It is an arithmetic number, because the mean of its divisors is an integer number (105000505105).

Almost surely, 2^210001010209 is an apocalyptic number.

It is an amenable number.

210001010209 is a deficient number, since it is larger than the sum of its proper divisors (1).

210001010209 is an equidigital number, since it uses as much as digits as its factorization.

210001010209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

The spelling of 210001010209 in words is "two hundred ten billion, one million, ten thousand, two hundred nine".