2112221 has 4 divisors (see below), whose sum is σ = 2132832. Its totient is φ = 2091612.

The previous prime is 2112217. The next prime is 2112239. The reversal of 2112221 is 1222112.

It is a happy number.

2112221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2112221 - 2² = 2112217 is a prime.

It is a super-2 number, since 2×2112221² = 8922955105682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112821) 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, 10151 + ... + 10356.

It is an arithmetic number, because the mean of its divisors is an integer number (533208).

2^2112221 is an apocalyptic number.

It is an amenable number.

2112221 is a deficient number, since it is larger than the sum of its proper divisors (20611).

2112221 is a wasteful number, since it uses less digits than its factorization.

2112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20610.

The product of its digits is 16, while the sum is 11.

The square root of 2112221 is about 1453.3482032878. The cubic root of 2112221 is about 128.3058482021.

Adding to 2112221 its reverse (1222112), we get a palindrome (3334333).

The spelling of 2112221 in words is "two million, one hundred twelve thousand, two hundred twenty-one".