212012222021 has 2 divisors, whose sum is σ = 212012222022. Its totient is φ = 212012222020.

The previous prime is 212012221987. The next prime is 212012222117. The reversal of 212012222021 is 120222210212.

It is a happy number.

212012222021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187601596900 + 24410625121 = 433130^2 + 156239^2 .

It is a cyclic number.

It is not a de Polignac number, because 212012222021 - 2¹⁴ = 212012205637 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 (212012222221) 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, 106006111010 + 106006111011.

It is an arithmetic number, because the mean of its divisors is an integer number (106006111011).

Almost surely, 2^212012222021 is an apocalyptic number.

It is an amenable number.

212012222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212012222021 is an equidigital number, since it uses as much as digits as its factorization.

212012222021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 212012222021 its reverse (120222210212), we get a palindrome (332234432233).

The spelling of 212012222021 in words is "two hundred twelve billion, twelve million, two hundred twenty-two thousand, twenty-one".