5816828021821 has 2 divisors, whose sum is σ = 5816828021822. Its totient is φ = 5816828021820.

The previous prime is 5816828021789. The next prime is 5816828021867. The reversal of 5816828021821 is 1281208286185.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5694852459321 + 121975562500 = 2386389^2 + 349250^2 .

It is a cyclic number.

It is not a de Polignac number, because 5816828021821 - 2⁵ = 5816828021789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5816828021891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2908414010910 + 2908414010911.

It is an arithmetic number, because the mean of its divisors is an integer number (2908414010911).

Almost surely, 2^{5816828021821} is an apocalyptic number.

It is an amenable number.

5816828021821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5816828021821 is an equidigital number, since it uses as much as digits as its factorization.

5816828021821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 983040, while the sum is 52.

The spelling of 5816828021821 in words is "five trillion, eight hundred sixteen billion, eight hundred twenty-eight million, twenty-one thousand, eight hundred twenty-one".