213443 has 4 divisors (see below), whose sum is σ = 214368. Its totient is φ = 212520.

The previous prime is 213407. The next prime is 213449. The reversal of 213443 is 344312.

It is a Cunningham number, because it is equal to 462²-1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 213443 - 2¹⁰ = 212419 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 213443.

It is not an unprimeable number, because it can be changed into a prime (213449) 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, 230 + ... + 692.

It is an arithmetic number, because the mean of its divisors is an integer number (53592).

2²¹³⁴⁴³ is an apocalyptic number.

213443 is a deficient number, since it is larger than the sum of its proper divisors (925).

213443 is an equidigital number, since it uses as much as digits as its factorization.

213443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924.

The product of its digits is 288, while the sum is 17.

The square root of 213443 is about 461.9989177477. The cubic root of 213443 is about 59.7623002985.

Adding to 213443 its reverse (344312), we get a palindrome (557755).

It can be divided in two parts, 213 and 443, that added together give a palindrome (656).

The spelling of 213443 in words is "two hundred thirteen thousand, four hundred forty-three".