12003221 has 2 divisors, whose sum is σ = 12003222. Its totient is φ = 12003220.

The previous prime is 12003209. The next prime is 12003227. The reversal of 12003221 is 12230021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6195121 + 5808100 = 2489^2 + 2410^2 .

It is a cyclic number.

It is not a de Polignac number, because 12003221 - 2¹⁴ = 11986837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12003227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6001610 + 6001611.

It is an arithmetic number, because the mean of its divisors is an integer number (6001611).

Almost surely, 2^12003221 is an apocalyptic number.

It is an amenable number.

12003221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12003221 is an equidigital number, since it uses as much as digits as its factorization.

12003221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 12003221 is about 3464.5664952487. The cubic root of 12003221 is about 228.9633307036.

Adding to 12003221 its reverse (12230021), we get a palindrome (24233242).

The spelling of 12003221 in words is "twelve million, three thousand, two hundred twenty-one".