216011 has 4 divisors (see below), whose sum is σ = 227400. Its totient is φ = 204624.

The previous prime is 215983. The next prime is 216023. The reversal of 216011 is 110612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216011 - 2¹⁰ = 214987 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215983 and 216001.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216011.

It is not an unprimeable number, because it can be changed into a prime (216061) by changing a digit.

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, 5666 + ... + 5703.

It is an arithmetic number, because the mean of its divisors is an integer number (56850).

216011 is a Friedman number, since it can be written as 60^(2+1)+11, using all its digits and the basic arithmetic operations.

2²¹⁶⁰¹¹ is an apocalyptic number.

216011 is a deficient number, since it is larger than the sum of its proper divisors (11389).

216011 is a wasteful number, since it uses less digits than its factorization.

216011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11388.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 216011 is about 464.7698355100. The cubic root of 216011 is about 60.0010185012.

Subtracting from 216011 its sum of digits (11), we obtain a cube (216000 = 60³).

Adding to 216011 its reverse (110612), we get a palindrome (326623).

The spelling of 216011 in words is "two hundred sixteen thousand, eleven".