12212020221221 has 2 divisors, whose sum is σ = 12212020221222. Its totient is φ = 12212020221220.

The previous prime is 12212020221173. The next prime is 12212020221253. The reversal of 12212020221221 is 12212202021221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12123105330625 + 88914890596 = 3481825^2 + 298186^2 .

It is an emirp because it is prime and its reverse (12212202021221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12212020221221 - 2⁶ = 12212020221157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12212020221193 and 12212020221202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12212020221721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106010110610 + 6106010110611.

It is an arithmetic number, because the mean of its divisors is an integer number (6106010110611).

Almost surely, 2^{12212020221221} is an apocalyptic number.

It is an amenable number.

12212020221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12212020221221 is an equidigital number, since it uses as much as digits as its factorization.

12212020221221 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 12212020221221 its reverse (12212202021221), we get a palindrome (24424222242442).

The spelling of 12212020221221 in words is "twelve trillion, two hundred twelve billion, twenty million, two hundred twenty-one thousand, two hundred twenty-one".