217334684172 has 96 divisors (see below), whose sum is σ = 538406668800. Its totient is φ = 68041631232.

The previous prime is 217334684143. The next prime is 217334684173. The reversal of 217334684172 is 271486433712.

It is not an unprimeable number, because it can be changed into a prime (217334684173) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26202858 + ... + 26211150.

It is an arithmetic number, because the mean of its divisors is an integer number (5608402800).

Almost surely, 2^217334684172 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 217334684172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269203334400).

217334684172 is an abundant number, since it is smaller than the sum of its proper divisors (321071984628).

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

217334684172 is a wasteful number, since it uses less digits than its factorization.

217334684172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9295 (or 9293 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 48.

The spelling of 217334684172 in words is "two hundred seventeen billion, three hundred thirty-four million, six hundred eighty-four thousand, one hundred seventy-two".