217331142 has 64 divisors (see below), whose sum is σ = 520224768. Its totient is φ = 59220000.

The previous prime is 217331141. The next prime is 217331167. The reversal of 217331142 is 241133712.

It is a happy number.

217331142 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217331141) 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, 91267 + ... + 93617.

It is an arithmetic number, because the mean of its divisors is an integer number (8128512).

Almost surely, 2^217331142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217331142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260112384).

217331142 is an abundant number, since it is smaller than the sum of its proper divisors (302893626).

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

217331142 is a wasteful number, since it uses less digits than its factorization.

217331142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2465.

The product of its digits is 1008, while the sum is 24.

The square root of 217331142 is about 14742.1552698376. The cubic root of 217331142 is about 601.2300156018.

Adding to 217331142 its reverse (241133712), we get a palindrome (458464854).

The spelling of 217331142 in words is "two hundred seventeen million, three hundred thirty-one thousand, one hundred forty-two".