12017021 has 2 divisors, whose sum is σ = 12017022. Its totient is φ = 12017020.

The previous prime is 12017003. The next prime is 12017051. The reversal of 12017021 is 12071021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11868025 + 148996 = 3445^2 + 386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12017021 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12016987 and 12017005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12017051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6008510 + 6008511.

It is an arithmetic number, because the mean of its divisors is an integer number (6008511).

Almost surely, 2^12017021 is an apocalyptic number.

It is an amenable number.

12017021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12017021 is an equidigital number, since it uses as much as digits as its factorization.

12017021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 12017021 is about 3466.5575143072. The cubic root of 12017021 is about 229.0510428226.

Adding to 12017021 its reverse (12071021), we get a palindrome (24088042).

The spelling of 12017021 in words is "twelve million, seventeen thousand, twenty-one".