216306207 has 24 divisors (see below), whose sum is σ = 348943504. Its totient is φ = 133109568.

The previous prime is 216306179. The next prime is 216306221. The reversal of 216306207 is 702603612.

It is a happy number.

216306207 is a `hidden beast` number, since 2 + 1 + 6 + 30 + 620 + 7 = 666.

216306207 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 216306207 - 2¹¹ = 216304159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216306247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31078 + ... + 37395.

Almost surely, 2^216306207 is an apocalyptic number.

216306207 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

216306207 is a deficient number, since it is larger than the sum of its proper divisors (132637297).

216306207 is an equidigital number, since it uses as much as digits as its factorization.

216306207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68501 (or 68489 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 216306207 is about 14707.3521410212. The cubic root of 216306207 is about 600.2833911280.

Adding to 216306207 its reverse (702603612), we get a palindrome (918909819).

The spelling of 216306207 in words is "two hundred sixteen million, three hundred six thousand, two hundred seven".