213502305 has 16 divisors (see below), whose sum is σ = 342241344. Its totient is φ = 113655360.

The previous prime is 213502279. The next prime is 213502309. The reversal of 213502305 is 503205312.

213502305 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 213502305 - 2²⁰ = 212453729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213502309) 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, 4806 + ... + 21215.

It is an arithmetic number, because the mean of its divisors is an integer number (21390084).

Almost surely, 2^213502305 is an apocalyptic number.

It is an amenable number.

213502305 is a deficient number, since it is larger than the sum of its proper divisors (128739039).

213502305 is a wasteful number, since it uses less digits than its factorization.

213502305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26576.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 213502305 is about 14611.7180714658. The cubic root of 213502305 is about 597.6783475814.

Adding to 213502305 its reverse (503205312), we get a palindrome (716707617).

The spelling of 213502305 in words is "two hundred thirteen million, five hundred two thousand, three hundred five".