216243105 has 24 divisors (see below), whose sum is σ = 374655168. Its totient is φ = 106456896.

The previous prime is 216243091. The next prime is 216243149. The reversal of 216243105 is 501342612.

It is not a de Polignac number, because 216243105 - 2⁴ = 216243089 is a prime.

It is a super-2 number, since 2×216243105² = 93522160920082050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40117 + ... + 45186.

It is an arithmetic number, because the mean of its divisors is an integer number (15610632).

Almost surely, 2^216243105 is an apocalyptic number.

It is an amenable number.

216243105 is a deficient number, since it is larger than the sum of its proper divisors (158412063).

216243105 is a wasteful number, since it uses less digits than its factorization.

216243105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85337 (or 85324 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 216243105 is about 14705.2067309508. The cubic root of 216243105 is about 600.2250128271.

Adding to 216243105 its reverse (501342612), we get a palindrome (717585717).

The spelling of 216243105 in words is "two hundred sixteen million, two hundred forty-three thousand, one hundred five".