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BaseRepresentation
bin111101011010000111101
310210020020201
413223100331
51003342341
6111043501
723050351
oct7532075
93706221
102012221
1111548a2
12810591
13555b83
143a5461
1529b331
hex1eb43d

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".