212091 has 8 divisors (see below), whose sum is σ = 308544. Its totient is φ = 128520.

The previous prime is 212081. The next prime is 212099. The reversal of 212091 is 190212.

It is a happy number.

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

It is not a de Polignac number, because 212091 - 2¹⁰ = 211067 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212091.

It is not an unprimeable number, because it can be changed into a prime (212099) 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, 3181 + ... + 3246.

It is an arithmetic number, because the mean of its divisors is an integer number (38568).

2²¹²⁰⁹¹ is an apocalyptic number.

212091 is a deficient number, since it is larger than the sum of its proper divisors (96453).

212091 is a wasteful number, since it uses less digits than its factorization.

212091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6441.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 212091 is about 460.5333864119. The cubic root of 212091 is about 59.6358499389.

It can be divided in two parts, 2120 and 91, that added together give a triangular number (2211 = T₆₆).

The spelling of 212091 in words is "two hundred twelve thousand, ninety-one".