217138106 has 8 divisors (see below), whose sum is σ = 329367060. Its totient is φ = 107349088.

The previous prime is 217138087. The next prime is 217138121. The reversal of 217138106 is 601831712.

It can be written as a sum of positive squares in 2 ways, for example, as 216825625 + 312481 = 14725^2 + 559^2 .

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, 609761 + ... + 610116.

Almost surely, 2^217138106 is an apocalyptic number.

217138106 is a deficient number, since it is larger than the sum of its proper divisors (112228954).

217138106 is a wasteful number, since it uses less digits than its factorization.

217138106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219968.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 217138106 is about 14735.6067401380. The cubic root of 217138106 is about 601.0519564201.

Adding to 217138106 its reverse (601831712), we get a palindrome (818969818).

The spelling of 217138106 in words is "two hundred seventeen million, one hundred thirty-eight thousand, one hundred six".