217125243 has 6 divisors (see below), whose sum is σ = 313625364. Its totient is φ = 144750156.

The previous prime is 217125229. The next prime is 217125253. The reversal of 217125243 is 342521712.

It is not a de Polignac number, because 217125243 - 2⁵ = 217125211 is a prime.

It is a super-2 number, since 2×217125243² = 94286742295618098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (217125203) 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, 12062505 + ... + 12062522.

It is an arithmetic number, because the mean of its divisors is an integer number (52270894).

Almost surely, 2^217125243 is an apocalyptic number.

217125243 is a deficient number, since it is larger than the sum of its proper divisors (96500121).

217125243 is a wasteful number, since it uses less digits than its factorization.

217125243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24125033 (or 24125030 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 217125243 is about 14735.1702738720. The cubic root of 217125243 is about 601.0400876543.

Adding to 217125243 its reverse (342521712), we get a palindrome (559646955).

The spelling of 217125243 in words is "two hundred seventeen million, one hundred twenty-five thousand, two hundred forty-three".