216206241 has 4 divisors (see below), whose sum is σ = 288274992. Its totient is φ = 144137492.

The previous prime is 216206219. The next prime is 216206261. The reversal of 216206241 is 142602612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216206241 - 2⁵ = 216206209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216206201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36034371 + ... + 36034376.

It is an arithmetic number, because the mean of its divisors is an integer number (72068748).

Almost surely, 2^216206241 is an apocalyptic number.

It is an amenable number.

216206241 is a deficient number, since it is larger than the sum of its proper divisors (72068751).

216206241 is an equidigital number, since it uses as much as digits as its factorization.

216206241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72068750.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 216206241 is about 14703.9532439409. The cubic root of 216206241 is about 600.1909031424.

Adding to 216206241 its reverse (142602612), we get a palindrome (358808853).

The spelling of 216206241 in words is "two hundred sixteen million, two hundred six thousand, two hundred forty-one".