216812 has 12 divisors (see below), whose sum is σ = 385560. Its totient is φ = 106656.

The previous prime is 216803. The next prime is 216829. The reversal of 216812 is 218612.

It is a super-3 number, since 3×216812³ = 30575333418897984, which contains 333 as substring.

It is a pancake number, because a pancake can be divided into 216812 parts by 658 straight cuts.

It is a plaindrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137 + ... + 672.

It is an arithmetic number, because the mean of its divisors is an integer number (32130).

2²¹⁶⁸¹² is an apocalyptic number.

It is an amenable number.

216812 is a deficient number, since it is larger than the sum of its proper divisors (168748).

216812 is a wasteful number, since it uses less digits than its factorization.

216812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880 (or 878 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

The square root of 216812 is about 465.6307549980. The cubic root of 216812 is about 60.0750911679.

The spelling of 216812 in words is "two hundred sixteen thousand, eight hundred twelve".