213440443 has 4 divisors (see below), whose sum is σ = 213668208. Its totient is φ = 213212680.

The previous prime is 213440441. The next prime is 213440453. The reversal of 213440443 is 344044312.

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 213440443 - 2¹ = 213440441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213440441) 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, 112471 + ... + 114352.

It is an arithmetic number, because the mean of its divisors is an integer number (53417052).

Almost surely, 2^213440443 is an apocalyptic number.

213440443 is a deficient number, since it is larger than the sum of its proper divisors (227765).

213440443 is an equidigital number, since it uses as much as digits as its factorization.

213440443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227764.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 213440443 is about 14609.6010554703. The cubic root of 213440443 is about 597.6206165115.

Adding to 213440443 its reverse (344044312), we get a palindrome (557484755).

The spelling of 213440443 in words is "two hundred thirteen million, four hundred forty thousand, four hundred forty-three".