216912 has 20 divisors (see below), whose sum is σ = 560480. Its totient is φ = 72288.

The previous prime is 216911. The next prime is 216917. The reversal of 216912 is 219612.

216912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2212 + ... + 2307.

It is an arithmetic number, because the mean of its divisors is an integer number (28024).

2²¹⁶⁹¹² is an apocalyptic number.

It is an amenable number.

216912 is an abundant number, since it is smaller than the sum of its proper divisors (343568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216912 is a wasteful number, since it uses less digits than its factorization.

216912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4530 (or 4524 counting only the distinct ones).

The product of its digits is 216, while the sum is 21.

The square root of 216912 is about 465.7381238421. The cubic root of 216912 is about 60.0843258747.

It can be divided in two parts, 216 and 912, that added together give a triangular number (1128 = T₄₇).

The spelling of 216912 in words is "two hundred sixteen thousand, nine hundred twelve".