211822 has 8 divisors (see below), whose sum is σ = 342216. Its totient is φ = 97752.

The previous prime is 211817. The next prime is 211859. The reversal of 211822 is 228112.

211822 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 211796 and 211805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4048 + ... + 4099.

It is an arithmetic number, because the mean of its divisors is an integer number (42777).

2²¹¹⁸²² is an apocalyptic number.

211822 is a deficient number, since it is larger than the sum of its proper divisors (130394).

211822 is a wasteful number, since it uses less digits than its factorization.

211822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8162.

The product of its digits is 64, while the sum is 16.

The square root of 211822 is about 460.2412410899. The cubic root of 211822 is about 59.6106267555.

Adding to 211822 its reverse (228112), we get a palindrome (439934).

Subtracting 211822 from its reverse (228112), we obtain a triangular number (16290 = T₁₈₀).

The spelling of 211822 in words is "two hundred eleven thousand, eight hundred twenty-two".