217125225 has 48 divisors (see below), whose sum is σ = 404904640. Its totient is φ = 114048000.

The previous prime is 217125211. The next prime is 217125229. The reversal of 217125225 is 522521712.

It is not a de Polignac number, because 217125225 - 2¹¹ = 217123177 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (217125229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42825 + ... + 47625.

Almost surely, 2^217125225 is an apocalyptic number.

217125225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

217125225 is a deficient number, since it is larger than the sum of its proper divisors (187779415).

217125225 is a wasteful number, since it uses less digits than its factorization.

217125225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4887 (or 4876 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 217125225 is about 14735.1696630884. The cubic root of 217125225 is about 601.0400710453.

Adding to 217125225 its reverse (522521712), we get a palindrome (739646937).

The spelling of 217125225 in words is "two hundred seventeen million, one hundred twenty-five thousand, two hundred twenty-five".