216985271 has 8 divisors (see below), whose sum is σ = 221061120. Its totient is φ = 212942808.

The previous prime is 216985261. The next prime is 216985283. The reversal of 216985271 is 172589612.

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

It is a cyclic number.

It is not a de Polignac number, because 216985271 - 2⁶ = 216985207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216985261) 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, 4970 + ... + 21416.

It is an arithmetic number, because the mean of its divisors is an integer number (27632640).

Almost surely, 2^216985271 is an apocalyptic number.

216985271 is a deficient number, since it is larger than the sum of its proper divisors (4075849).

216985271 is a wasteful number, since it uses less digits than its factorization.

216985271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16693.

The product of its digits is 60480, while the sum is 41.

The square root of 216985271 is about 14730.4199193370. The cubic root of 216985271 is about 600.9109043519.

The spelling of 216985271 in words is "two hundred sixteen million, nine hundred eighty-five thousand, two hundred seventy-one".