216043 has 4 divisors (see below), whose sum is σ = 221920. Its totient is φ = 210168.

The previous prime is 216037. The next prime is 216061. The reversal of 216043 is 340612.

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 216043 - 2⁹ = 215531 is a prime.

It is a Duffinian number.

216043 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (216023) 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, 2883 + ... + 2956.

It is an arithmetic number, because the mean of its divisors is an integer number (55480).

216043 is a Friedman number, since it can be written as 60^3+42+1, using all its digits and the basic arithmetic operations.

2²¹⁶⁰⁴³ is an apocalyptic number.

216043 is a deficient number, since it is larger than the sum of its proper divisors (5877).

216043 is an equidigital number, since it uses as much as digits as its factorization.

216043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5876.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 216043 is about 464.8042598772. The cubic root of 216043 is about 60.0039812173.

Adding to 216043 its reverse (340612), we get a palindrome (556655).

The spelling of 216043 in words is "two hundred sixteen thousand, forty-three".