12012102101821 has 2 divisors, whose sum is σ = 12012102101822. Its totient is φ = 12012102101820.

The previous prime is 12012102101819. The next prime is 12012102101863. The reversal of 12012102101821 is 12810120121021.

It is a happy number.

12012102101821 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., 9923539527225 + 2088562574596 = 3150165^2 + 1445186^2 .

It is a cyclic number.

It is not a de Polignac number, because 12012102101821 - 2¹ = 12012102101819 is a prime.

Together with 12012102101819, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 12012102101792 and 12012102101801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12012102108821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006051050910 + 6006051050911.

It is an arithmetic number, because the mean of its divisors is an integer number (6006051050911).

Almost surely, 2^{12012102101821} is an apocalyptic number.

It is an amenable number.

12012102101821 is a deficient number, since it is larger than the sum of its proper divisors (1).

12012102101821 is an equidigital number, since it uses as much as digits as its factorization.

12012102101821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 22.

Adding to 12012102101821 its reverse (12810120121021), we get a palindrome (24822222222842).

The spelling of 12012102101821 in words is "twelve trillion, twelve billion, one hundred two million, one hundred one thousand, eight hundred twenty-one".