211887 has 12 divisors (see below), whose sum is σ = 329784. Its totient is φ = 130320.

The previous prime is 211879. The next prime is 211889. The reversal of 211887 is 788112.

It is not a de Polignac number, because 211887 - 2³ = 211879 is a prime.

It is a super-2 number, since 2×211887² = 89792201538, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 789 + ... + 1022.

It is an arithmetic number, because the mean of its divisors is an integer number (27482).

2²¹¹⁸⁸⁷ is an apocalyptic number.

211887 is a deficient number, since it is larger than the sum of its proper divisors (117897).

211887 is a wasteful number, since it uses less digits than its factorization.

211887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830 (or 1827 counting only the distinct ones).

The product of its digits is 896, while the sum is 27.

The square root of 211887 is about 460.3118508142. The cubic root of 211887 is about 59.6167235325.

Adding to 211887 its reverse (788112), we get a palindrome (999999).

The spelling of 211887 in words is "two hundred eleven thousand, eight hundred eighty-seven".