821671980719841 has 96 divisors (see below), whose sum is σ = 1218035103008256. Its totient is φ = 533601250560000.

The previous prime is 821671980719833. The next prime is 821671980719893. The reversal of 821671980719841 is 148917089176128.

It is not a de Polignac number, because 821671980719841 - 2³ = 821671980719833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 821671980719841.

It is not an unprimeable number, because it can be changed into a prime (821671980719741) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 109018436025 + ... + 109018443561.

It is an arithmetic number, because the mean of its divisors is an integer number (12687865656336).

Almost surely, 2^{821671980719841} is an apocalyptic number.

It is an amenable number.

821671980719841 is a deficient number, since it is larger than the sum of its proper divisors (396363122288415).

821671980719841 is a wasteful number, since it uses less digits than its factorization.

821671980719841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11023 (or 11020 counting only the distinct ones).

The product of its (nonzero) digits is 97542144, while the sum is 72.

The spelling of 821671980719841 in words is "eight hundred twenty-one trillion, six hundred seventy-one billion, nine hundred eighty million, seven hundred nineteen thousand, eight hundred forty-one".