212000209 has 2 divisors, whose sum is σ = 212000210. Its totient is φ = 212000208.

The previous prime is 212000203. The next prime is 212000219. The reversal of 212000209 is 902000212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153140625 + 58859584 = 12375^2 + 7672^2 .

It is a cyclic number.

It is not a de Polignac number, because 212000209 - 2¹¹ = 211998161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212000192 and 212000201.

It is not a weakly prime, because it can be changed into another prime (212000203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106000104 + 106000105.

It is an arithmetic number, because the mean of its divisors is an integer number (106000105).

Almost surely, 2^212000209 is an apocalyptic number.

It is an amenable number.

212000209 is a deficient number, since it is larger than the sum of its proper divisors (1).

212000209 is an equidigital number, since it uses as much as digits as its factorization.

212000209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 212000209 is about 14560.2269556487. The cubic root of 212000209 is about 596.2733917194.

The spelling of 212000209 in words is "two hundred twelve million, two hundred nine", and thus it is an aban number.