82705304021 has 2 divisors, whose sum is σ = 82705304022. Its totient is φ = 82705304020.

The previous prime is 82705303987. The next prime is 82705304029. The reversal of 82705304021 is 12040350728.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80128624900 + 2576679121 = 283070^2 + 50761^2 .

It is a cyclic number.

It is not a de Polignac number, because 82705304021 - 2¹⁸ = 82705041877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82705304029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41352652010 + 41352652011.

It is an arithmetic number, because the mean of its divisors is an integer number (41352652011).

Almost surely, 2^82705304021 is an apocalyptic number.

It is an amenable number.

82705304021 is a deficient number, since it is larger than the sum of its proper divisors (1).

82705304021 is an equidigital number, since it uses as much as digits as its factorization.

82705304021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 32.

Adding to 82705304021 its reverse (12040350728), we get a palindrome (94745654749).

The spelling of 82705304021 in words is "eighty-two billion, seven hundred five million, three hundred four thousand, twenty-one".