2012221 has 2 divisors, whose sum is σ = 2012222.
Its totient is φ = 2012220.
The previous prime is 2012203. The next prime is 2012237. The reversal of 2012221 is 1222102.
Adding to 2012221 its reverse (1222102), we get a palindrome (3234323).
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 1863225 + 148996 = 1365^2 + 386^2
It is a cyclic number.
It is not a de Polignac number, because 2012221 - 25 = 2012189 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 2012198 and 2012207.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (2012821) 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 as a sum of consecutive naturals, namely, 1006110 + 1006111.
It is an arithmetic number, because the mean of its divisors is an integer number (1006111).
22012221 is an apocalyptic number.
It is an amenable number.
2012221 is a deficient number, since it is larger than the sum of its proper divisors (1).
2012221 is an equidigital number, since it uses as much as digits as its factorization.
2012221 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 16, while the sum is 10.
The square root of 2012221 is about 1418.5277579237.
The cubic root of 2012221 is about 126.2482089737.
The spelling of 2012221 in words is "two million, twelve thousand, two hundred twenty-one".