217081205 has 16 divisors (see below), whose sum is σ = 284515200. Its totient is φ = 157690560.

The previous prime is 217081187. The next prime is 217081217. The reversal of 217081205 is 502180712.

It is not a de Polignac number, because 217081205 - 2¹⁰ = 217080181 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59216 + ... + 62774.

It is an arithmetic number, because the mean of its divisors is an integer number (17782200).

Almost surely, 2^217081205 is an apocalyptic number.

It is an amenable number.

217081205 is a deficient number, since it is larger than the sum of its proper divisors (67433995).

217081205 is a wasteful number, since it uses less digits than its factorization.

217081205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4684.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 217081205 is about 14733.6758821416. The cubic root of 217081205 is about 600.9994499826. Note that the first 3 decimals are identical.

The spelling of 217081205 in words is "two hundred seventeen million, eighty-one thousand, two hundred five".