12002021121221 has 2 divisors, whose sum is σ = 12002021121222. Its totient is φ = 12002021121220.

The previous prime is 12002021121169. The next prime is 12002021121241. The reversal of 12002021121221 is 12212112020021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9233175040996 + 2768846080225 = 3038614^2 + 1663985^2 .

It is an emirp because it is prime and its reverse (12212112020021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12002021121221 - 2¹⁸ = 12002020859077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12002021121221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12002021121241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6001010560610 + 6001010560611.

It is an arithmetic number, because the mean of its divisors is an integer number (6001010560611).

Almost surely, 2^{12002021121221} is an apocalyptic number.

It is an amenable number.

12002021121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12002021121221 is an equidigital number, since it uses as much as digits as its factorization.

12002021121221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12002021121221 its reverse (12212112020021), we get a palindrome (24214133141242).

The spelling of 12002021121221 in words is "twelve trillion, two billion, twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".