212111 has 4 divisors (see below), whose sum is σ = 216672. Its totient is φ = 207552.

The previous prime is 212099. The next prime is 212117. The reversal of 212111 is 111212.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-212111 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 (212117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2210 + ... + 2303.

It is an arithmetic number, because the mean of its divisors is an integer number (54168).

2²¹²¹¹¹ is an apocalyptic number.

212111 is a deficient number, since it is larger than the sum of its proper divisors (4561).

212111 is an equidigital number, since it uses as much as digits as its factorization.

212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4560.

The product of its digits is 4, while the sum is 8.

The square root of 212111 is about 460.5550998523. Note that the first 3 decimals coincide. The cubic root of 212111 is about 59.6377244165.

Adding to 212111 its reverse (111212), we get a palindrome (323323).

It can be divided in two parts, 21211 and 1, that added together give a palindrome (21212).

The spelling of 212111 in words is "two hundred twelve thousand, one hundred eleven", and thus it is an iban number.