216771 has 8 divisors (see below), whose sum is σ = 304320. Its totient is φ = 136872.

The previous prime is 216761. The next prime is 216779. The reversal of 216771 is 177612.

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

It is not a de Polignac number, because 216771 - 2⁹ = 216259 is a prime.

It is a plaindrome in base 13.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (216779) 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, 1845 + ... + 1958.

It is an arithmetic number, because the mean of its divisors is an integer number (38040).

2²¹⁶⁷⁷¹ is an apocalyptic number.

216771 is a deficient number, since it is larger than the sum of its proper divisors (87549).

216771 is a wasteful number, since it uses less digits than its factorization.

216771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3825.

The product of its digits is 588, while the sum is 24.

The square root of 216771 is about 465.5867266149. The cubic root of 216771 is about 60.0713041174.

The spelling of 216771 in words is "two hundred sixteen thousand, seven hundred seventy-one".