216933261 has 8 divisors (see below), whose sum is σ = 290187744. Its totient is φ = 144150480.

The previous prime is 216933259. The next prime is 216933271. The reversal of 216933261 is 162339612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216933261 - 2¹ = 216933259 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216933221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116850 + ... + 118691.

It is an arithmetic number, because the mean of its divisors is an integer number (36273468).

Almost surely, 2^216933261 is an apocalyptic number.

It is an amenable number.

216933261 is a deficient number, since it is larger than the sum of its proper divisors (73254483).

216933261 is a wasteful number, since it uses less digits than its factorization.

216933261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235851.

The product of its digits is 11664, while the sum is 33.

The square root of 216933261 is about 14728.6544191925. The cubic root of 216933261 is about 600.8628889983.

The spelling of 216933261 in words is "two hundred sixteen million, nine hundred thirty-three thousand, two hundred sixty-one".