12000011001221 has 2 divisors, whose sum is σ = 12000011001222. Its totient is φ = 12000011001220.

The previous prime is 12000011001157. The next prime is 12000011001257. The reversal of 12000011001221 is 12210011000021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6797570056225 + 5202440944996 = 2607215^2 + 2280886^2 .

It is a cyclic number.

It is not a de Polignac number, because 12000011001221 - 2⁶ = 12000011001157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12000011001281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6000005500610 + 6000005500611.

It is an arithmetic number, because the mean of its divisors is an integer number (6000005500611).

Almost surely, 2^{12000011001221} is an apocalyptic number.

It is an amenable number.

12000011001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12000011001221 is an equidigital number, since it uses as much as digits as its factorization.

12000011001221 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 11.

Adding to 12000011001221 its reverse (12210011000021), we get a palindrome (24210022001242).

The spelling of 12000011001221 in words is "twelve trillion, eleven million, one thousand, two hundred twenty-one".