217222242 has 8 divisors (see below), whose sum is σ = 434444496. Its totient is φ = 72407412.

The previous prime is 217222237. The next prime is 217222259. The reversal of 217222242 is 242222712.

It is a sphenic number, since it is the product of 3 distinct primes.

217222242 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18101848 + ... + 18101859.

It is an arithmetic number, because the mean of its divisors is an integer number (54305562).

Almost surely, 2^217222242 is an apocalyptic number.

217222242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

217222242 is a wasteful number, since it uses less digits than its factorization.

217222242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36203712.

The product of its digits is 1792, while the sum is 24.

The square root of 217222242 is about 14738.4613172475. The cubic root of 217222242 is about 601.1295776449.

Adding to 217222242 its reverse (242222712), we get a palindrome (459444954).

The spelling of 217222242 in words is "two hundred seventeen million, two hundred twenty-two thousand, two hundred forty-two".