217129338 has 48 divisors (see below), whose sum is σ = 519794496. Its totient is φ = 65155200.

The previous prime is 217129333. The next prime is 217129343. The reversal of 217129338 is 833921712.

217129338 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (217129333) and next prime (217129343).

It is not an unprimeable number, because it can be changed into a prime (217129333) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8388 + ... + 22463.

It is an arithmetic number, because the mean of its divisors is an integer number (10829052).

Almost surely, 2^217129338 is an apocalyptic number.

217129338 is an abundant number, since it is smaller than the sum of its proper divisors (302665158).

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

217129338 is a wasteful number, since it uses less digits than its factorization.

217129338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30899 (or 30896 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 217129338 is about 14735.3092264805. The cubic root of 217129338 is about 601.0438661858.

The spelling of 217129338 in words is "two hundred seventeen million, one hundred twenty-nine thousand, three hundred thirty-eight".