216443343 has 4 divisors (see below), whose sum is σ = 288591128. Its totient is φ = 144295560.

The previous prime is 216443291. The next prime is 216443347. The reversal of 216443343 is 343344612.

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

It is not a de Polignac number, because 216443343 - 2¹² = 216439247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216443343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216443347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36073888 + ... + 36073893.

It is an arithmetic number, because the mean of its divisors is an integer number (72147782).

Almost surely, 2^216443343 is an apocalyptic number.

216443343 is a deficient number, since it is larger than the sum of its proper divisors (72147785).

216443343 is an equidigital number, since it uses as much as digits as its factorization.

216443343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72147784.

The product of its digits is 20736, while the sum is 30.

The square root of 216443343 is about 14712.0135603526. The cubic root of 216443343 is about 600.4102222434.

Adding to 216443343 its reverse (343344612), we get a palindrome (559787955).

The spelling of 216443343 in words is "two hundred sixteen million, four hundred forty-three thousand, three hundred forty-three".