12020121101221 has 2 divisors, whose sum is σ = 12020121101222. Its totient is φ = 12020121101220.

The previous prime is 12020121101213. The next prime is 12020121101267. The reversal of 12020121101221 is 12210112102021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10897822404225 + 1122298696996 = 3301185^2 + 1059386^2 .

It is an emirp because it is prime and its reverse (12210112102021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12020121101221 - 2³ = 12020121101213 is a prime.

It is a super-2 number, since 2×12020121101221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12020121101195 and 12020121101204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12020121101621) 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, 6010060550610 + 6010060550611.

It is an arithmetic number, because the mean of its divisors is an integer number (6010060550611).

Almost surely, 2^{12020121101221} is an apocalyptic number.

It is an amenable number.

12020121101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12020121101221 is an equidigital number, since it uses as much as digits as its factorization.

12020121101221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12020121101221 its reverse (12210112102021), we get a palindrome (24230233203242).

The spelling of 12020121101221 in words is "twelve trillion, twenty billion, one hundred twenty-one million, one hundred one thousand, two hundred twenty-one".