216108243 has 30 divisors (see below), whose sum is σ = 349593684. Its totient is φ = 132981264.

The previous prime is 216108227. The next prime is 216108257. The reversal of 216108243 is 342801612.

216108243 is a `hidden beast` number, since 2 + 1 + 610 + 8 + 2 + 43 = 666.

216108243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216108243 - 2⁴ = 216108227 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (216106243) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 5796 + ... + 21582.

Almost surely, 2^216108243 is an apocalyptic number.

216108243 is a deficient number, since it is larger than the sum of its proper divisors (133485441).

216108243 is a wasteful number, since it uses less digits than its factorization.

216108243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15825 (or 15803 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 216108243 is about 14700.6204971083. The cubic root of 216108243 is about 600.1002082629.

Adding to 216108243 its reverse (342801612), we get a palindrome (558909855).

The spelling of 216108243 in words is "two hundred sixteen million, one hundred eight thousand, two hundred forty-three".