212191 has 4 divisors (see below), whose sum is σ = 242512. Its totient is φ = 181872.

The previous prime is 212183. The next prime is 212203. The reversal of 212191 is 191212.

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

It is a cyclic number.

It is not a de Polignac number, because 212191 - 2³ = 212183 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15150 + ... + 15163.

It is an arithmetic number, because the mean of its divisors is an integer number (60628).

2²¹²¹⁹¹ is an apocalyptic number.

212191 is a deficient number, since it is larger than the sum of its proper divisors (30321).

212191 is an equidigital number, since it uses as much as digits as its factorization.

212191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30320.

The product of its digits is 36, while the sum is 16.

The square root of 212191 is about 460.6419433790. The cubic root of 212191 is about 59.6452211490.

The spelling of 212191 in words is "two hundred twelve thousand, one hundred ninety-one".