216102213 has 6 divisors (see below), whose sum is σ = 312147654. Its totient is φ = 144068136.

The previous prime is 216102151. The next prime is 216102221. The reversal of 216102213 is 312201612.

216102213 is a `hidden beast` number, since 21 + 610 + 22 + 13 = 666.

216102213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 185995044 + 30107169 = 13638^2 + 5487^2 .

It is not a de Polignac number, because 216102213 - 2⁶ = 216102149 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216102233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12005670 + ... + 12005687.

It is an arithmetic number, because the mean of its divisors is an integer number (52024609).

Almost surely, 2^216102213 is an apocalyptic number.

It is an amenable number.

216102213 is a deficient number, since it is larger than the sum of its proper divisors (96045441).

216102213 is a wasteful number, since it uses less digits than its factorization.

216102213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24011363 (or 24011360 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 216102213 is about 14700.4154022939. The cubic root of 216102213 is about 600.0946267422.

Adding to 216102213 its reverse (312201612), we get a palindrome (528303825).

The spelling of 216102213 in words is "two hundred sixteen million, one hundred two thousand, two hundred thirteen".