12021200142221 has 2 divisors, whose sum is σ = 12021200142222. Its totient is φ = 12021200142220.

The previous prime is 12021200142209. The next prime is 12021200142239. The reversal of 12021200142221 is 12224100212021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11814412584100 + 206787558121 = 3437210^2 + 454739^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021200142221 - 2³⁰ = 12020126400397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12021200142193 and 12021200142202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12021200145221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010600071110 + 6010600071111.

It is an arithmetic number, because the mean of its divisors is an integer number (6010600071111).

Almost surely, 2^{12021200142221} is an apocalyptic number.

It is an amenable number.

12021200142221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021200142221 is an equidigital number, since it uses as much as digits as its factorization.

12021200142221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 12021200142221 its reverse (12224100212021), we get a palindrome (24245300354242).

The spelling of 12021200142221 in words is "twelve trillion, twenty-one billion, two hundred million, one hundred forty-two thousand, two hundred twenty-one".