2100010020209 has 2 divisors, whose sum is σ = 2100010020210. Its totient is φ = 2100010020208.

The previous prime is 2100010020203. The next prime is 2100010020221. The reversal of 2100010020209 is 9020200100012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1781797825600 + 318212194609 = 1334840^2 + 564103^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100010020209 - 2³² = 2095715052913 is a prime.

It is not a weakly prime, because it can be changed into another prime (2100010020203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050005010104 + 1050005010105.

It is an arithmetic number, because the mean of its divisors is an integer number (1050005010105).

Almost surely, 2^{2100010020209} is an apocalyptic number.

It is an amenable number.

2100010020209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100010020209 is an equidigital number, since it uses as much as digits as its factorization.

2100010020209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The spelling of 2100010020209 in words is "two trillion, one hundred billion, ten million, twenty thousand, two hundred nine".