82853571821 has 4 divisors (see below), whose sum is σ = 82854429600. Its totient is φ = 82852714044.

The previous prime is 82853571811. The next prime is 82853571919. The reversal of 82853571821 is 12817535828.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 82853571821 - 2¹⁰ = 82853570797 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82853571821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82853571811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262481 + ... + 484358.

It is an arithmetic number, because the mean of its divisors is an integer number (20713607400).

Almost surely, 2^82853571821 is an apocalyptic number.

It is an amenable number.

82853571821 is a deficient number, since it is larger than the sum of its proper divisors (857779).

82853571821 is a wasteful number, since it uses less digits than its factorization.

82853571821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857778.

The product of its digits is 1075200, while the sum is 50.

The spelling of 82853571821 in words is "eighty-two billion, eight hundred fifty-three million, five hundred seventy-one thousand, eight hundred twenty-one".