211386 has 24 divisors (see below), whose sum is σ = 492480. Its totient is φ = 60312.

The previous prime is 211373. The next prime is 211403. The reversal of 211386 is 683112.

211386 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a plaindrome in base 11.

It is an unprimeable number.

211386 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66 + ... + 653.

It is an arithmetic number, because the mean of its divisors is an integer number (20520).

2²¹¹³⁸⁶ is an apocalyptic number.

211386 is an abundant number, since it is smaller than the sum of its proper divisors (281094).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211386 is a wasteful number, since it uses less digits than its factorization.

211386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738 (or 731 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 211386 is about 459.7673324628. The cubic root of 211386 is about 59.5696991750.

Adding to 211386 its reverse (683112), we get a palindrome (894498).

The spelling of 211386 in words is "two hundred eleven thousand, three hundred eighty-six".