213012243 has 24 divisors (see below), whose sum is σ = 313934400. Its totient is φ = 139140144.

The previous prime is 213012209. The next prime is 213012259. The reversal of 213012243 is 342210312.

213012243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213012243 - 2⁸ = 213011987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213012263) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 247548 + ... + 248406.

It is an arithmetic number, because the mean of its divisors is an integer number (13080600).

Almost surely, 2^213012243 is an apocalyptic number.

213012243 is a deficient number, since it is larger than the sum of its proper divisors (100922157).

213012243 is a wasteful number, since it uses less digits than its factorization.

213012243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391 (or 1388 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 213012243 is about 14594.9389515681. The cubic root of 213012243 is about 597.2207040686.

Adding to 213012243 its reverse (342210312), we get a palindrome (555222555).

The spelling of 213012243 in words is "two hundred thirteen million, twelve thousand, two hundred forty-three".