128217112 has 16 divisors (see below), whose sum is σ = 241260840. Its totient is φ = 63880896.

The previous prime is 128217109. The next prime is 128217119. The reversal of 128217112 is 211712821.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128217119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26053 + ... + 30580.

Almost surely, 2^128217112 is an apocalyptic number.

It is an amenable number.

128217112 is a deficient number, since it is larger than the sum of its proper divisors (113043728).

128217112 is a wasteful number, since it uses less digits than its factorization.

128217112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56922 (or 56918 counting only the distinct ones).

The product of its digits is 448, while the sum is 25.

The square root of 128217112 is about 11323.2995191331. The cubic root of 128217112 is about 504.2532006495.

Adding to 128217112 its reverse (211712821), we get a palindrome (339929933).

The spelling of 128217112 in words is "one hundred twenty-eight million, two hundred seventeen thousand, one hundred twelve".