216507105 has 12 divisors (see below), whose sum is σ = 375279060. Its totient is φ = 115470432.

The previous prime is 216507103. The next prime is 216507113. The reversal of 216507105 is 501705612.

216507105 is a `hidden beast` number, since 2 + 1 + 650 + 7 + 1 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 38044224 + 178462881 = 6168^2 + 13359^2 .

It is not a de Polignac number, because 216507105 - 2¹ = 216507103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216507103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2405590 + ... + 2405679.

It is an arithmetic number, because the mean of its divisors is an integer number (31273255).

Almost surely, 2^216507105 is an apocalyptic number.

It is an amenable number.

216507105 is a deficient number, since it is larger than the sum of its proper divisors (158771955).

216507105 is a wasteful number, since it uses less digits than its factorization.

216507105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4811280 (or 4811277 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 216507105 is about 14714.1804053097. The cubic root of 216507105 is about 600.4691746962.

It can be divided in two parts, 216507 and 105, that added together give a palindrome (216612).

The spelling of 216507105 in words is "two hundred sixteen million, five hundred seven thousand, one hundred five".