216750721225 has 24 divisors (see below), whose sum is σ = 287240642208. Its totient is φ = 161675270400.

The previous prime is 216750721217. The next prime is 216750721241. The reversal of 216750721225 is 522127057612.

216750721225 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 216750721225 - 2³ = 216750721217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2337711 + ... + 2428660.

It is an arithmetic number, because the mean of its divisors is an integer number (11968360092).

Almost surely, 2^216750721225 is an apocalyptic number.

216750721225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216750721225 is a deficient number, since it is larger than the sum of its proper divisors (70489920983).

216750721225 is a wasteful number, since it uses less digits than its factorization.

216750721225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4766505 (or 4766500 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 40.

Adding to 216750721225 its reverse (522127057612), we get a palindrome (738877778837).

The spelling of 216750721225 in words is "two hundred sixteen billion, seven hundred fifty million, seven hundred twenty-one thousand, two hundred twenty-five".