12010001221 has 2 divisors, whose sum is σ = 12010001222. Its totient is φ = 12010001220.

The previous prime is 12010001209. The next prime is 12010001231. The reversal of 12010001221 is 12210001021.

12010001221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (12010001231) can be obtained adding 12010001221 to its sum of digits (10).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11949550596 + 60450625 = 109314^2 + 7775^2 .

It is a cyclic number.

It is not a de Polignac number, because 12010001221 - 2¹³ = 12009993029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12010001198 and 12010001207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12010001231) 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, 6005000610 + 6005000611.

It is an arithmetic number, because the mean of its divisors is an integer number (6005000611).

Almost surely, 2^12010001221 is an apocalyptic number.

It is an amenable number.

12010001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12010001221 is an equidigital number, since it uses as much as digits as its factorization.

12010001221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 12010001221 its reverse (12210001021), we get a palindrome (24220002242).

The spelling of 12010001221 in words is "twelve billion, ten million, one thousand, two hundred twenty-one".