209674221 has 16 divisors (see below), whose sum is σ = 282668928. Its totient is φ = 138240000.

The previous prime is 209674219. The next prime is 209674229. The reversal of 209674221 is 122476902.

It is not a de Polignac number, because 209674221 - 2¹ = 209674219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209674229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115521 + ... + 117321.

It is an arithmetic number, because the mean of its divisors is an integer number (17666808).

Almost surely, 2^209674221 is an apocalyptic number.

It is an amenable number.

209674221 is a deficient number, since it is larger than the sum of its proper divisors (72994707).

209674221 is a wasteful number, since it uses less digits than its factorization.

209674221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2212.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 209674221 is about 14480.1319400066. The cubic root of 209674221 is about 594.0846703323.

The spelling of 209674221 in words is "two hundred nine million, six hundred seventy-four thousand, two hundred twenty-one".