209211242 has 16 divisors (see below), whose sum is σ = 332022240. Its totient is φ = 98593488.

The previous prime is 209211217. The next prime is 209211293. The reversal of 209211242 is 242112902.

209211242 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6488 + ... + 21459.

It is an arithmetic number, because the mean of its divisors is an integer number (20751390).

Almost surely, 2^209211242 is an apocalyptic number.

209211242 is a deficient number, since it is larger than the sum of its proper divisors (122810998).

209211242 is a wasteful number, since it uses less digits than its factorization.

209211242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28165.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 209211242 is about 14464.1364069895. The cubic root of 209211242 is about 593.6470844783.

The spelling of 209211242 in words is "two hundred nine million, two hundred eleven thousand, two hundred forty-two".