12012000021221 has 2 divisors, whose sum is σ = 12012000021222. Its totient is φ = 12012000021220.

The previous prime is 12012000021199. The next prime is 12012000021223. The reversal of 12012000021221 is 12212000021021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6726185193121 + 5285814828100 = 2593489^2 + 2299090^2 .

It is a cyclic number.

It is not a de Polignac number, because 12012000021221 - 2⁶ = 12012000021157 is a prime.

Together with 12012000021223, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12012000021196 and 12012000021205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12012000021223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006000010610 + 6006000010611.

It is an arithmetic number, because the mean of its divisors is an integer number (6006000010611).

Almost surely, 2^{12012000021221} is an apocalyptic number.

It is an amenable number.

12012000021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12012000021221 is an equidigital number, since it uses as much as digits as its factorization.

12012000021221 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 14.

Adding to 12012000021221 its reverse (12212000021021), we get a palindrome (24224000042242).

The spelling of 12012000021221 in words is "twelve trillion, twelve billion, twenty-one thousand, two hundred twenty-one".