2212291 has 4 divisors (see below), whose sum is σ = 2215584. Its totient is φ = 2209000.

The previous prime is 2212277. The next prime is 2212297. The reversal of 2212291 is 1922122.

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

It is a 3-Lehmer number, since φ(2212291) divides (2212291-1)³.

It is a cyclic number.

It is not a de Polignac number, because 2212291 - 2⁹ = 2211779 is a prime.

It is a Duffinian number.

2212291 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2212297) 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, 235 + ... + 2116.

It is an arithmetic number, because the mean of its divisors is an integer number (553896).

2^2212291 is an apocalyptic number.

2212291 is the 941-st heptagonal number.

2212291 is a deficient number, since it is larger than the sum of its proper divisors (3293).

2212291 is an equidigital number, since it uses as much as digits as its factorization.

2212291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3292.

The product of its digits is 144, while the sum is 19.

The square root of 2212291 is about 1487.3772218237. The cubic root of 2212291 is about 130.3009006251.

It can be divided in two parts, 22122 and 91, that multiplied together give a palindrome (2013102).

The spelling of 2212291 in words is "two million, two hundred twelve thousand, two hundred ninety-one".