82109896021 has 2 divisors, whose sum is σ = 82109896022. Its totient is φ = 82109896020.

The previous prime is 82109896007. The next prime is 82109896051. The reversal of 82109896021 is 12069890128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52141439025 + 29968456996 = 228345^2 + 173114^2 .

It is a cyclic number.

It is not a de Polignac number, because 82109896021 - 2⁷ = 82109895893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82109896051) 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, 41054948010 + 41054948011.

It is an arithmetic number, because the mean of its divisors is an integer number (41054948011).

Almost surely, 2^82109896021 is an apocalyptic number.

It is an amenable number.

82109896021 is a deficient number, since it is larger than the sum of its proper divisors (1).

82109896021 is an equidigital number, since it uses as much as digits as its factorization.

82109896021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 46.

The spelling of 82109896021 in words is "eighty-two billion, one hundred nine million, eight hundred ninety-six thousand, twenty-one".