12011212030021 has 2 divisors, whose sum is σ = 12011212030022. Its totient is φ = 12011212030020.

The previous prime is 12011212030019. The next prime is 12011212030043. The reversal of 12011212030021 is 12003021211021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11958213544225 + 52998485796 = 3458065^2 + 230214^2 .

It is a cyclic number.

It is not a de Polignac number, because 12011212030021 - 2¹ = 12011212030019 is a prime.

Together with 12011212030019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 12011212029977 and 12011212030004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12011212730021) 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, 6005606015010 + 6005606015011.

It is an arithmetic number, because the mean of its divisors is an integer number (6005606015011).

Almost surely, 2^{12011212030021} is an apocalyptic number.

It is an amenable number.

12011212030021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12011212030021 is an equidigital number, since it uses as much as digits as its factorization.

12011212030021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12011212030021 its reverse (12003021211021), we get a palindrome (24014233241042).

The spelling of 12011212030021 in words is "twelve trillion, eleven billion, two hundred twelve million, thirty thousand, twenty-one".