213443243 has 16 divisors (see below), whose sum is σ = 244399680. Its totient is φ = 184888704.

The previous prime is 213443239. The next prime is 213443249. The reversal of 213443243 is 342344312.

It is not a de Polignac number, because 213443243 - 2² = 213443239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213443249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9113 + ... + 22581.

It is an arithmetic number, because the mean of its divisors is an integer number (15274980).

Almost surely, 2^213443243 is an apocalyptic number.

213443243 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

213443243 is a deficient number, since it is larger than the sum of its proper divisors (30956437).

213443243 is a wasteful number, since it uses less digits than its factorization.

213443243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13558.

The product of its digits is 6912, while the sum is 26.

The square root of 213443243 is about 14609.6968825503. The cubic root of 213443243 is about 597.6232297782.

Adding to 213443243 its reverse (342344312), we get a palindrome (555787555).

The spelling of 213443243 in words is "two hundred thirteen million, four hundred forty-three thousand, two hundred forty-three".