12212222020021 has 2 divisors, whose sum is σ = 12212222020022. Its totient is φ = 12212222020020.

The previous prime is 12212222020013. The next prime is 12212222020091. The reversal of 12212222020021 is 12002022221221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8368210841796 + 3844011178225 = 2892786^2 + 1960615^2 .

It is a cyclic number.

It is not a de Polignac number, because 12212222020021 - 2³ = 12212222020013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12212222020091) 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, 6106111010010 + 6106111010011.

It is an arithmetic number, because the mean of its divisors is an integer number (6106111010011).

Almost surely, 2^{12212222020021} is an apocalyptic number.

It is an amenable number.

12212222020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12212222020021 is an equidigital number, since it uses as much as digits as its factorization.

12212222020021 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 19.

Adding to 12212222020021 its reverse (12002022221221), we get a palindrome (24214244241242).

The spelling of 12212222020021 in words is "twelve trillion, two hundred twelve billion, two hundred twenty-two million, twenty thousand, twenty-one".