216730105 has 16 divisors (see below), whose sum is σ = 268640064. Its totient is φ = 167751360.

The previous prime is 216730103. The next prime is 216730109. The reversal of 216730105 is 501037612.

It is not a de Polignac number, because 216730105 - 2¹ = 216730103 is a prime.

It is a super-2 number, since 2×216730105² = 93943876826622050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216730105.

It is not an unprimeable number, because it can be changed into a prime (216730103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18295 + ... + 27715.

It is an arithmetic number, because the mean of its divisors is an integer number (16790004).

Almost surely, 2^216730105 is an apocalyptic number.

It is an amenable number.

216730105 is a deficient number, since it is larger than the sum of its proper divisors (51909959).

216730105 is a wasteful number, since it uses less digits than its factorization.

216730105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9576.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 216730105 is about 14721.7561792063. The cubic root of 216730105 is about 600.6752628964.

Adding to 216730105 its reverse (501037612), we get a palindrome (717767717).

The spelling of 216730105 in words is "two hundred sixteen million, seven hundred thirty thousand, one hundred five".