82856891321 has 2 divisors, whose sum is σ = 82856891322. Its totient is φ = 82856891320.

The previous prime is 82856891303. The next prime is 82856891371. The reversal of 82856891321 is 12319865828.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62290176400 + 20566714921 = 249580^2 + 143411^2 .

It is a cyclic number.

It is not a de Polignac number, because 82856891321 - 2²² = 82852697017 is a prime.

It is not a weakly prime, because it can be changed into another prime (82856891371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41428445660 + 41428445661.

It is an arithmetic number, because the mean of its divisors is an integer number (41428445661).

Almost surely, 2^82856891321 is an apocalyptic number.

It is an amenable number.

82856891321 is a deficient number, since it is larger than the sum of its proper divisors (1).

82856891321 is an equidigital number, since it uses as much as digits as its factorization.

82856891321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1658880, while the sum is 53.

The spelling of 82856891321 in words is "eighty-two billion, eight hundred fifty-six million, eight hundred ninety-one thousand, three hundred twenty-one".