213211 has 4 divisors (see below), whose sum is σ = 215424. Its totient is φ = 211000.

The previous prime is 213209. The next prime is 213217. The reversal of 213211 is 112312.

213211 = 186² + 187² + ... + 191².

213211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 213211 - 2¹ = 213209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213217) 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, 955 + ... + 1156.

It is an arithmetic number, because the mean of its divisors is an integer number (53856).

2²¹³²¹¹ is an apocalyptic number.

213211 is the 207-th centered decagonal number.

213211 is a deficient number, since it is larger than the sum of its proper divisors (2213).

213211 is a wasteful number, since it uses less digits than its factorization.

213211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2212.

The product of its digits is 12, while the sum is 10.

The square root of 213211 is about 461.7477666432. The cubic root of 213211 is about 59.7406397457.

Adding to 213211 its reverse (112312), we get a palindrome (325523).

It can be divided in two parts, 213 and 211, that added together give a palindrome (424).

The spelling of 213211 in words is "two hundred thirteen thousand, two hundred eleven".