213720211 has 4 divisors (see below), whose sum is σ = 213785424. Its totient is φ = 213655000.

The previous prime is 213720187. The next prime is 213720217. The reversal of 213720211 is 112027312.

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 213720211 - 2⁷ = 213720083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213720217) 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, 27415 + ... + 34336.

It is an arithmetic number, because the mean of its divisors is an integer number (53446356).

Almost surely, 2^213720211 is an apocalyptic number.

213720211 is a deficient number, since it is larger than the sum of its proper divisors (65213).

213720211 is an equidigital number, since it uses as much as digits as its factorization.

213720211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65212.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 213720211 is about 14619.1727194120. The cubic root of 213720211 is about 597.8816137946.

Adding to 213720211 its reverse (112027312), we get a palindrome (325747523).

The spelling of 213720211 in words is "two hundred thirteen million, seven hundred twenty thousand, two hundred eleven".