217321093 has 4 divisors (see below), whose sum is σ = 237077568. Its totient is φ = 197564620.

The previous prime is 217321087. The next prime is 217321109. The reversal of 217321093 is 390123712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 217321093 - 2⁵ = 217321061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217321063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9878221 + ... + 9878242.

It is an arithmetic number, because the mean of its divisors is an integer number (59269392).

Almost surely, 2^217321093 is an apocalyptic number.

It is an amenable number.

217321093 is a deficient number, since it is larger than the sum of its proper divisors (19756475).

217321093 is a wasteful number, since it uses less digits than its factorization.

217321093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19756474.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 217321093 is about 14741.8144405633. The cubic root of 217321093 is about 601.2207488618.

The spelling of 217321093 in words is "two hundred seventeen million, three hundred twenty-one thousand, ninety-three".