12201110021 has 2 divisors, whose sum is σ = 12201110022. Its totient is φ = 12201110020.

The previous prime is 12201110011. The next prime is 12201110083. The reversal of 12201110021 is 12001110221.

12201110021 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., 11643489025 + 557620996 = 107905^2 + 23614^2 .

It is an emirp because it is prime and its reverse (12001110221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12201110021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12201109984 and 12201110011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12201110011) 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, 6100555010 + 6100555011.

It is an arithmetic number, because the mean of its divisors is an integer number (6100555011).

Almost surely, 2^12201110021 is an apocalyptic number.

It is an amenable number.

12201110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12201110021 is an equidigital number, since it uses as much as digits as its factorization.

12201110021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 12201110021 its reverse (12001110221), we get a palindrome (24202220242).

The spelling of 12201110021 in words is "twelve billion, two hundred one million, one hundred ten thousand, twenty-one".