213310221 has 16 divisors (see below), whose sum is σ = 287109504. Its totient is φ = 140865984.

The previous prime is 213310187. The next prime is 213310231. The reversal of 213310221 is 122013312.

It is not a de Polignac number, because 213310221 - 2⁶ = 213310157 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 213310221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213310231) 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, 163056 + ... + 164358.

It is an arithmetic number, because the mean of its divisors is an integer number (17944344).

Almost surely, 2^213310221 is an apocalyptic number.

It is an amenable number.

213310221 is a deficient number, since it is larger than the sum of its proper divisors (73799283).

213310221 is a wasteful number, since it uses less digits than its factorization.

213310221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 213310221 is about 14605.1436487287. The cubic root of 213310221 is about 597.4990538199.

Adding to 213310221 its reverse (122013312), we get a palindrome (335323533).

It can be divided in two parts, 213310 and 221, that added together give a triangular number (213531 = T₆₅₃).

The spelling of 213310221 in words is "two hundred thirteen million, three hundred ten thousand, two hundred twenty-one".