217224138 has 16 divisors (see below), whose sum is σ = 438435360. Its totient is φ = 71743536.

The previous prime is 217224103. The next prime is 217224143. The reversal of 217224138 is 831422712.

It is a super-2 number, since 2×217224138² = 94372652259686088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165420 + ... + 166727.

It is an arithmetic number, because the mean of its divisors is an integer number (27402210).

Almost surely, 2^217224138 is an apocalyptic number.

217224138 is an abundant number, since it is smaller than the sum of its proper divisors (221211222).

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

217224138 is a wasteful number, since it uses less digits than its factorization.

217224138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332261.

The product of its digits is 5376, while the sum is 30.

The square root of 217224138 is about 14738.5256386112. The cubic root of 217224138 is about 601.1313266039.

The spelling of 217224138 in words is "two hundred seventeen million, two hundred twenty-four thousand, one hundred thirty-eight".