212011110344221 has 2 divisors, whose sum is σ = 212011110344222. Its totient is φ = 212011110344220.

The previous prime is 212011110344213. The next prime is 212011110344339. The reversal of 212011110344221 is 122443011110212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132078820428025 + 79932289916196 = 11492555^2 + 8940486^2 .

It is a cyclic number.

It is not a de Polignac number, because 212011110344221 - 2³ = 212011110344213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212011110344821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106005555172110 + 106005555172111.

It is an arithmetic number, because the mean of its divisors is an integer number (106005555172111).

Almost surely, 2^{212011110344221} is an apocalyptic number.

It is an amenable number.

212011110344221 is a deficient number, since it is larger than the sum of its proper divisors (1).

212011110344221 is an equidigital number, since it uses as much as digits as its factorization.

212011110344221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 25.

Adding to 212011110344221 its reverse (122443011110212), we get a palindrome (334454121454433).

The spelling of 212011110344221 in words is "two hundred twelve trillion, eleven billion, one hundred ten million, three hundred forty-four thousand, two hundred twenty-one".