217216238 has 8 divisors (see below), whose sum is σ = 326219880. Its totient is φ = 108476280.

The previous prime is 217216201. The next prime is 217216247. The reversal of 217216238 is 832612712.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63848 + ... + 67163.

It is an arithmetic number, because the mean of its divisors is an integer number (40777485).

Almost surely, 2^217216238 is an apocalyptic number.

217216238 is a deficient number, since it is larger than the sum of its proper divisors (109003642).

217216238 is a wasteful number, since it uses less digits than its factorization.

217216238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131842.

The product of its digits is 8064, while the sum is 32.

The square root of 217216238 is about 14738.2576310770. The cubic root of 217216238 is about 601.1240392077.

The spelling of 217216238 in words is "two hundred seventeen million, two hundred sixteen thousand, two hundred thirty-eight".