209118212 has 12 divisors (see below), whose sum is σ = 366084096. Its totient is φ = 104522760.

The previous prime is 209118211. The next prime is 209118223. The reversal of 209118212 is 212811902.

It is not an unprimeable number, because it can be changed into a prime (209118211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7037 + ... + 21627.

It is an arithmetic number, because the mean of its divisors is an integer number (30507008).

Almost surely, 2^209118212 is an apocalyptic number.

It is an amenable number.

209118212 is a deficient number, since it is larger than the sum of its proper divisors (156965884).

209118212 is a wasteful number, since it uses less digits than its factorization.

209118212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18178 (or 18176 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 209118212 is about 14460.9201643602. The cubic root of 209118212 is about 593.5590790479.

The spelling of 209118212 in words is "two hundred nine million, one hundred eighteen thousand, two hundred twelve".