211812 has 24 divisors (see below), whose sum is σ = 520800. Its totient is φ = 66816.

The previous prime is 211811. The next prime is 211817. The reversal of 211812 is 218112.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 211791 and 211800.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 211812.

It is not an unprimeable number, because it can be changed into a prime (211811) 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, 237 + ... + 692.

It is an arithmetic number, because the mean of its divisors is an integer number (21700).

2²¹¹⁸¹² is an apocalyptic number.

It is an amenable number.

211812 is an abundant number, since it is smaller than the sum of its proper divisors (308988).

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

211812 is a wasteful number, since it uses less digits than its factorization.

211812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955 (or 953 counting only the distinct ones).

The product of its digits is 32, while the sum is 15.

The square root of 211812 is about 460.2303770939. The cubic root of 211812 is about 59.6096886791.

Adding to 211812 its reverse (218112), we get a palindrome (429924).

The spelling of 211812 in words is "two hundred eleven thousand, eight hundred twelve".