821738842841 has 16 divisors (see below), whose sum is σ = 962184332928. Its totient is φ = 687062217600.

The previous prime is 821738842807. The next prime is 821738842853. The reversal of 821738842841 is 148248837128.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 821738842841 - 2¹⁰ = 821738841817 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (821738842861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1668011 + ... + 2103743.

It is an arithmetic number, because the mean of its divisors is an integer number (60136520808).

Almost surely, 2^821738842841 is an apocalyptic number.

It is an amenable number.

821738842841 is a deficient number, since it is larger than the sum of its proper divisors (140445490087).

821738842841 is a wasteful number, since it uses less digits than its factorization.

821738842841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442352.

The product of its digits is 5505024, while the sum is 56.

The spelling of 821738842841 in words is "eight hundred twenty-one billion, seven hundred thirty-eight million, eight hundred forty-two thousand, eight hundred forty-one".