217040112 has 60 divisors (see below), whose sum is σ = 613465944. Its totient is φ = 71625600.

The previous prime is 217040111. The next prime is 217040123. The reversal of 217040112 is 211040712.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217040111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7083 + ... + 22005.

Almost surely, 2^217040112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217040112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306732972).

217040112 is an abundant number, since it is smaller than the sum of its proper divisors (396425832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217040112 is a wasteful number, since it uses less digits than its factorization.

217040112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15038 (or 15029 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 217040112 is about 14732.2812897392. The cubic root of 217040112 is about 600.9615249598.

Adding to 217040112 its reverse (211040712), we get a palindrome (428080824).

The spelling of 217040112 in words is "two hundred seventeen million, forty thousand, one hundred twelve".