213111211 has 2 divisors, whose sum is σ = 213111212. Its totient is φ = 213111210.

The previous prime is 213111209. The next prime is 213111221. The reversal of 213111211 is 112111312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213111211 - 2¹ = 213111209 is a prime.

Together with 213111209, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 213111191 and 213111200.

It is not a weakly prime, because it can be changed into another prime (213111221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106555605 + 106555606.

It is an arithmetic number, because the mean of its divisors is an integer number (106555606).

Almost surely, 2^213111211 is an apocalyptic number.

213111211 is a deficient number, since it is larger than the sum of its proper divisors (1).

213111211 is an equidigital number, since it uses as much as digits as its factorization.

213111211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12, while the sum is 13.

The square root of 213111211 is about 14598.3290482164. The cubic root of 213111211 is about 597.3131816752.

Adding to 213111211 its reverse (112111312), we get a palindrome (325222523).

It can be divided in two parts, 21311 and 1211, that added together give a palindrome (22522).

The spelling of 213111211 in words is "two hundred thirteen million, one hundred eleven thousand, two hundred eleven".