217343023 has 4 divisors (see below), whose sum is σ = 224837640. Its totient is φ = 209848408.

The previous prime is 217343003. The next prime is 217343117. The reversal of 217343023 is 320343712.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 217343023 - 2²¹ = 215245871 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 (217343003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3747265 + ... + 3747322.

It is an arithmetic number, because the mean of its divisors is an integer number (56209410).

Almost surely, 2^217343023 is an apocalyptic number.

217343023 is a deficient number, since it is larger than the sum of its proper divisors (7494617).

217343023 is an equidigital number, since it uses as much as digits as its factorization.

217343023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7494616.

The product of its (nonzero) digits is 3024, while the sum is 25.

The square root of 217343023 is about 14742.5582244060. The cubic root of 217343023 is about 601.2409713621.

Adding to 217343023 its reverse (320343712), we get a palindrome (537686735).

The spelling of 217343023 in words is "two hundred seventeen million, three hundred forty-three thousand, twenty-three".