210133209 has 32 divisors (see below), whose sum is σ = 348534144. Its totient is φ = 110638080.

The previous prime is 210133207. The next prime is 210133213. The reversal of 210133209 is 902331012.

It is a happy number.

It is not a de Polignac number, because 210133209 - 2¹ = 210133207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (210133207) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7114 + ... + 21699.

It is an arithmetic number, because the mean of its divisors is an integer number (10891692).

Almost surely, 2^210133209 is an apocalyptic number.

It is an amenable number.

210133209 is a deficient number, since it is larger than the sum of its proper divisors (138400935).

210133209 is a wasteful number, since it uses less digits than its factorization.

210133209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28857.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 210133209 is about 14495.9721647084. The cubic root of 210133209 is about 594.5178486956.

The spelling of 210133209 in words is "two hundred ten million, one hundred thirty-three thousand, two hundred nine".