216387105 has 64 divisors (see below), whose sum is σ = 414996480. Its totient is φ = 95040000.

The previous prime is 216387089. The next prime is 216387109. The reversal of 216387105 is 501783612.

216387105 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 216387105 - 2⁴ = 216387089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216387109) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 70605 + ... + 73605.

It is an arithmetic number, because the mean of its divisors is an integer number (6484320).

Almost surely, 2^216387105 is an apocalyptic number.

It is an amenable number.

216387105 is a deficient number, since it is larger than the sum of its proper divisors (198609375).

216387105 is a wasteful number, since it uses less digits than its factorization.

216387105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3062.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 216387105 is about 14710.1021410458. The cubic root of 216387105 is about 600.3582166477.

The spelling of 216387105 in words is "two hundred sixteen million, three hundred eighty-seven thousand, one hundred five".