1084804565821 has 4 divisors (see below), whose sum is σ = 1084806982044. Its totient is φ = 1084802149600.

The previous prime is 1084804565813. The next prime is 1084804565843. The reversal of 1084804565821 is 1285654084801.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 780729520921 + 304075044900 = 883589^2 + 551430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1084804565821 - 2³ = 1084804565813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1084804565921) 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, 314170 + ... + 1506091.

It is an arithmetic number, because the mean of its divisors is an integer number (271201745511).

Almost surely, 2^{1084804565821} is an apocalyptic number.

It is an amenable number.

1084804565821 is a deficient number, since it is larger than the sum of its proper divisors (2416223).

1084804565821 is an equidigital number, since it uses as much as digits as its factorization.

1084804565821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2416222.

The product of its (nonzero) digits is 2457600, while the sum is 52.

The spelling of 1084804565821 in words is "one trillion, eighty-four billion, eight hundred four million, five hundred sixty-five thousand, eight hundred twenty-one".