12021021222121 has 2 divisors, whose sum is σ = 12021021222122. Its totient is φ = 12021021222120.

The previous prime is 12021021222097. The next prime is 12021021222193. The reversal of 12021021222121 is 12122212012021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7317917677225 + 4703103544896 = 2705165^2 + 2168664^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021021222121 - 2³³ = 12012431287529 is a prime.

It is not a weakly prime, because it can be changed into another prime (12021021222521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010510611060 + 6010510611061.

It is an arithmetic number, because the mean of its divisors is an integer number (6010510611061).

Almost surely, 2^{12021021222121} is an apocalyptic number.

It is an amenable number.

12021021222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021021222121 is an equidigital number, since it uses as much as digits as its factorization.

12021021222121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12021021222121 its reverse (12122212012021), we get a palindrome (24143233234142).

The spelling of 12021021222121 in words is "twelve trillion, twenty-one billion, twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".