216324225 has 54 divisors (see below), whose sum is σ = 419631810. Its totient is φ = 106479360.

The previous prime is 216324211. The next prime is 216324257. The reversal of 216324225 is 522423612.

It is a happy number.

216324225 is a `hidden beast` number, since 2 + 1 + 632 + 4 + 2 + 25 = 666.

It can be written as a sum of positive squares in 9 ways, for example, as 76895361 + 139428864 = 8769^2 + 11808^2 .

It is not a de Polignac number, because 216324225 - 2⁴ = 216324209 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 35181 + ... + 40869.

Almost surely, 2^216324225 is an apocalyptic number.

216324225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216324225 is a deficient number, since it is larger than the sum of its proper divisors (203307585).

216324225 is a wasteful number, since it uses less digits than its factorization.

216324225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5731 (or 5710 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 216324225 is about 14707.9646790438. The cubic root of 216324225 is about 600.3000582501.

Adding to 216324225 its reverse (522423612), we get a palindrome (738747837).

The spelling of 216324225 in words is "two hundred sixteen million, three hundred twenty-four thousand, two hundred twenty-five".