217043 has 4 divisors (see below), whose sum is σ = 218880. Its totient is φ = 215208.

The previous prime is 217033. The next prime is 217057. The reversal of 217043 is 340712.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 217043 - 2⁴ = 217027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217003) 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, 728 + ... + 981.

It is an arithmetic number, because the mean of its divisors is an integer number (54720).

2²¹⁷⁰⁴³ is an apocalyptic number.

217043 is a deficient number, since it is larger than the sum of its proper divisors (1837).

217043 is a wasteful number, since it uses less digits than its factorization.

217043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 217043 is about 465.8787395879. The cubic root of 217043 is about 60.0964190472.

Adding to 217043 its reverse (340712), we get a palindrome (557755).

The spelling of 217043 in words is "two hundred seventeen thousand, forty-three", and thus it is an iban number.