211855 has 8 divisors (see below), whose sum is σ = 290592. Its totient is φ = 145248.

The previous prime is 211817. The next prime is 211859. The reversal of 211855 is 558112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211855 - 2⁷ = 211727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2992 + ... + 3061.

It is an arithmetic number, because the mean of its divisors is an integer number (36324).

2²¹¹⁸⁵⁵ is an apocalyptic number.

211855 is a deficient number, since it is larger than the sum of its proper divisors (78737).

211855 is an equidigital number, since it uses as much as digits as its factorization.

211855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6065.

The product of its digits is 400, while the sum is 22.

The square root of 211855 is about 460.2770904575. The cubic root of 211855 is about 59.6137221981.

Adding to 211855 its reverse (558112), we get a palindrome (769967).

The spelling of 211855 in words is "two hundred eleven thousand, eight hundred fifty-five".