216225237 has 4 divisors (see below), whose sum is σ = 288300320. Its totient is φ = 144150156.

The previous prime is 216225221. The next prime is 216225253. The reversal of 216225237 is 732522612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (216225221) and next prime (216225253).

It is not a de Polignac number, because 216225237 - 2⁴ = 216225221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216225287) 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, 36037537 + ... + 36037542.

It is an arithmetic number, because the mean of its divisors is an integer number (72075080).

Almost surely, 2^216225237 is an apocalyptic number.

It is an amenable number.

216225237 is a deficient number, since it is larger than the sum of its proper divisors (72075083).

216225237 is an equidigital number, since it uses as much as digits as its factorization.

216225237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72075082.

The product of its digits is 10080, while the sum is 30.

The square root of 216225237 is about 14704.5991784883. The cubic root of 216225237 is about 600.2084803293.

Adding to 216225237 its reverse (732522612), we get a palindrome (948747849).

The spelling of 216225237 in words is "two hundred sixteen million, two hundred twenty-five thousand, two hundred thirty-seven".