212291 has 4 divisors (see below), whose sum is σ = 217272. Its totient is φ = 207312.

The previous prime is 212281. The next prime is 212293. The reversal of 212291 is 192212.

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 212291 - 2⁶ = 212227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2426 + ... + 2511.

It is an arithmetic number, because the mean of its divisors is an integer number (54318).

2²¹²²⁹¹ is an apocalyptic number.

212291 is a deficient number, since it is larger than the sum of its proper divisors (4981).

212291 is an equidigital number, since it uses as much as digits as its factorization.

212291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4980.

The product of its digits is 72, while the sum is 17.

The square root of 212291 is about 460.7504747692. The cubic root of 212291 is about 59.6545894153.

The spelling of 212291 in words is "two hundred twelve thousand, two hundred ninety-one".