216671 has 8 divisors (see below), whose sum is σ = 266784. Its totient is φ = 171360.

The previous prime is 216661. The next prime is 216679. The reversal of 216671 is 176612.

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

It is not a de Polignac number, because 216671 - 2⁶ = 216607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216679) 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, 1100 + ... + 1281.

It is an arithmetic number, because the mean of its divisors is an integer number (33348).

2²¹⁶⁶⁷¹ is an apocalyptic number.

216671 is a deficient number, since it is larger than the sum of its proper divisors (50113).

216671 is a wasteful number, since it uses less digits than its factorization.

216671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2401.

The product of its digits is 504, while the sum is 23.

The square root of 216671 is about 465.4793228490. The cubic root of 216671 is about 60.0620654056.

The spelling of 216671 in words is "two hundred sixteen thousand, six hundred seventy-one".