12120010001221 has 2 divisors, whose sum is σ = 12120010001222. Its totient is φ = 12120010001220.

The previous prime is 12120010001147. The next prime is 12120010001327. The reversal of 12120010001221 is 12210001002121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10309332964225 + 1810677036996 = 3210815^2 + 1345614^2 .

It is a cyclic number.

It is not a de Polignac number, because 12120010001221 - 2¹¹ = 12120009999173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12120010031221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060005000610 + 6060005000611.

It is an arithmetic number, because the mean of its divisors is an integer number (6060005000611).

Almost surely, 2^{12120010001221} is an apocalyptic number.

It is an amenable number.

12120010001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12120010001221 is an equidigital number, since it uses as much as digits as its factorization.

12120010001221 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 13.

Adding to 12120010001221 its reverse (12210001002121), we get a palindrome (24330011003342).

The spelling of 12120010001221 in words is "twelve trillion, one hundred twenty billion, ten million, one thousand, two hundred twenty-one".