211100209 has 2 divisors, whose sum is σ = 211100210. Its totient is φ = 211100208.

The previous prime is 211100167. The next prime is 211100231. The reversal of 211100209 is 902001112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122213025 + 88887184 = 11055^2 + 9428^2 .

It is a cyclic number.

It is not a de Polignac number, because 211100209 - 2¹¹ = 211098161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211100192 and 211100201.

It is not a weakly prime, because it can be changed into another prime (211100009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105550104 + 105550105.

It is an arithmetic number, because the mean of its divisors is an integer number (105550105).

Almost surely, 2^211100209 is an apocalyptic number.

It is an amenable number.

211100209 is a deficient number, since it is larger than the sum of its proper divisors (1).

211100209 is an equidigital number, since it uses as much as digits as its factorization.

211100209 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 square root of 211100209 is about 14529.2879729187. The cubic root of 211100209 is about 595.4284125953.

The spelling of 211100209 in words is "two hundred eleven million, one hundred thousand, two hundred nine".