212011209 has 8 divisors (see below), whose sum is σ = 314090720. Its totient is φ = 141340788.

The previous prime is 212011207. The next prime is 212011223. The reversal of 212011209 is 902110212.

It is not a de Polignac number, because 212011209 - 2¹ = 212011207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212011191 and 212011200.

It is not an unprimeable number, because it can be changed into a prime (212011207) 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 in 7 ways as a sum of consecutive naturals, for example, 3926107 + ... + 3926160.

It is an arithmetic number, because the mean of its divisors is an integer number (39261340).

Almost surely, 2^212011209 is an apocalyptic number.

It is an amenable number.

212011209 is a deficient number, since it is larger than the sum of its proper divisors (102079511).

212011209 is an equidigital number, since it uses as much as digits as its factorization.

212011209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7852276 (or 7852270 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 212011209 is about 14560.6046921136. The cubic root of 212011209 is about 596.2837044355.

The spelling of 212011209 in words is "two hundred twelve million, eleven thousand, two hundred nine".