211845 has 16 divisors (see below), whose sum is σ = 351360. Its totient is φ = 108864.

The previous prime is 211817. The next prime is 211859. The reversal of 211845 is 548112.

It is not a de Polignac number, because 211845 - 2⁶ = 211781 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192 + ... + 678.

It is an arithmetic number, because the mean of its divisors is an integer number (21960).

2²¹¹⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

211845 is a deficient number, since it is larger than the sum of its proper divisors (139515).

211845 is a wasteful number, since it uses less digits than its factorization.

211845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524.

The product of its digits is 320, while the sum is 21.

The square root of 211845 is about 460.2662273076. The cubic root of 211845 is about 59.6127842191.

Adding to 211845 its reverse (548112), we get a palindrome (759957).

The spelling of 211845 in words is "two hundred eleven thousand, eight hundred forty-five".