216241 has 4 divisors (see below), whose sum is σ = 218484. Its totient is φ = 214000.

The previous prime is 216233. The next prime is 216259. The reversal of 216241 is 142612.

216241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 207025 + 9216 = 455^2 + 96^2 .

It is a cyclic number.

It is not a de Polignac number, because 216241 - 2³ = 216233 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a zygodrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (216211) 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, 970 + ... + 1171.

It is an arithmetic number, because the mean of its divisors is an integer number (54621).

2²¹⁶²⁴¹ is an apocalyptic number.

It is an amenable number.

216241 is a deficient number, since it is larger than the sum of its proper divisors (2243).

216241 is a wasteful number, since it uses less digits than its factorization.

216241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2242.

The product of its digits is 96, while the sum is 16.

The square root of 216241 is about 465.0172039828. The cubic root of 216241 is about 60.0223065208.

Subtracting from 216241 its sum of digits (16), we obtain a square (216225 = 465²).

Adding to 216241 its reverse (142612), we get a palindrome (358853).

The spelling of 216241 in words is "two hundred sixteen thousand, two hundred forty-one".