216306071 has 4 divisors (see below), whose sum is σ = 216342000. Its totient is φ = 216270144.

The previous prime is 216306067. The next prime is 216306073. The reversal of 216306071 is 170603612.

216306071 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216306071 - 2² = 216306067 is a prime.

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 216306071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216306073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6491 + ... + 21788.

It is an arithmetic number, because the mean of its divisors is an integer number (54085500).

Almost surely, 2^216306071 is an apocalyptic number.

216306071 is a deficient number, since it is larger than the sum of its proper divisors (35929).

216306071 is an equidigital number, since it uses as much as digits as its factorization.

216306071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35928.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 216306071 is about 14707.3475174825. The cubic root of 216306071 is about 600.2832653210.

Adding to 216306071 its reverse (170603612), we get a palindrome (386909683).

The spelling of 216306071 in words is "two hundred sixteen million, three hundred six thousand, seventy-one".