10815844021 has 2 divisors, whose sum is σ = 10815844022. Its totient is φ = 10815844020.

The previous prime is 10815844007. The next prime is 10815844049. The reversal of 10815844021 is 12044851801.

It is a happy number.

10815844021 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., 5921302500 + 4894541521 = 76950^2 + 69961^2 .

It is an emirp because it is prime and its reverse (12044851801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10815844021 - 2⁷ = 10815843893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10815844621) 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, 5407922010 + 5407922011.

It is an arithmetic number, because the mean of its divisors is an integer number (5407922011).

Almost surely, 2^10815844021 is an apocalyptic number.

It is an amenable number.

10815844021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10815844021 is an equidigital number, since it uses as much as digits as its factorization.

10815844021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10240, while the sum is 34.

The spelling of 10815844021 in words is "ten billion, eight hundred fifteen million, eight hundred forty-four thousand, twenty-one".