217112138 has 8 divisors (see below), whose sum is σ = 333611460. Its totient is φ = 105908320.

The previous prime is 217112123. The next prime is 217112167. The reversal of 217112138 is 831211712.

It can be written as a sum of positive squares in 2 ways, for example, as 215414329 + 1697809 = 14677^2 + 1303^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1323773 + ... + 1323936.

Almost surely, 2^217112138 is an apocalyptic number.

217112138 is a deficient number, since it is larger than the sum of its proper divisors (116499322).

217112138 is a wasteful number, since it uses less digits than its factorization.

217112138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2647752.

The product of its digits is 672, while the sum is 26.

The square root of 217112138 is about 14734.7255827857. The cubic root of 217112138 is about 601.0279951116.

The spelling of 217112138 in words is "two hundred seventeen million, one hundred twelve thousand, one hundred thirty-eight".