213434565 has 16 divisors (see below), whose sum is σ = 347284800. Its totient is φ = 111901952.

The previous prime is 213434563. The next prime is 213434579. The reversal of 213434565 is 565434312.

It is a cyclic number.

It is not a de Polignac number, because 213434565 - 2¹ = 213434563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213434563) 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, 119700 + ... + 121469.

It is an arithmetic number, because the mean of its divisors is an integer number (21705300).

Almost surely, 2^213434565 is an apocalyptic number.

It is an amenable number.

213434565 is a deficient number, since it is larger than the sum of its proper divisors (133850235).

213434565 is a wasteful number, since it uses less digits than its factorization.

213434565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241236.

The product of its digits is 43200, while the sum is 33.

The square root of 213434565 is about 14609.3998850055. The cubic root of 213434565 is about 597.6151304437.

Adding to 213434565 its reverse (565434312), we get a palindrome (778868877).

It can be divided in two parts, 213 and 434565, that added together give a triangular number (434778 = T₉₃₂).

The spelling of 213434565 in words is "two hundred thirteen million, four hundred thirty-four thousand, five hundred sixty-five".