213520211 has 4 divisors (see below), whose sum is σ = 213611832. Its totient is φ = 213428592.

The previous prime is 213520207. The next prime is 213520231. The reversal of 213520211 is 112025312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213520211 - 2² = 213520207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213520211.

It is not an unprimeable number, because it can be changed into a prime (213520231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42221 + ... + 47006.

It is an arithmetic number, because the mean of its divisors is an integer number (53402958).

Almost surely, 2^213520211 is an apocalyptic number.

213520211 is a deficient number, since it is larger than the sum of its proper divisors (91621).

213520211 is an equidigital number, since it uses as much as digits as its factorization.

213520211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91620.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 213520211 is about 14612.3307860177. The cubic root of 213520211 is about 597.6950557997.

Adding to 213520211 its reverse (112025312), we get a palindrome (325545523).

The spelling of 213520211 in words is "two hundred thirteen million, five hundred twenty thousand, two hundred eleven".