212212220333021 has 2 divisors, whose sum is σ = 212212220333022. Its totient is φ = 212212220333020.

The previous prime is 212212220332939. The next prime is 212212220333051. The reversal of 212212220333021 is 120333022212212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211996919692996 + 215300640025 = 14560114^2 + 464005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212212220333021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212212220333051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106106110166510 + 106106110166511.

It is an arithmetic number, because the mean of its divisors is an integer number (106106110166511).

Almost surely, 2^{212212220333021} is an apocalyptic number.

It is an amenable number.

212212220333021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212212220333021 is an equidigital number, since it uses as much as digits as its factorization.

212212220333021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 212212220333021 its reverse (120333022212212), we get a palindrome (332545242545233).

The spelling of 212212220333021 in words is "two hundred twelve trillion, two hundred twelve billion, two hundred twenty million, three hundred thirty-three thousand, twenty-one".