804078080921 has 2 divisors, whose sum is σ = 804078080922. Its totient is φ = 804078080920.

The previous prime is 804078080909. The next prime is 804078080957. The reversal of 804078080921 is 129080870408.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 798949945600 + 5128135321 = 893840^2 + 71611^2 .

It is a cyclic number.

It is not a de Polignac number, because 804078080921 - 2³⁰ = 803004339097 is a prime.

It is not a weakly prime, because it can be changed into another prime (804078080821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402039040460 + 402039040461.

It is an arithmetic number, because the mean of its divisors is an integer number (402039040461).

Almost surely, 2^804078080921 is an apocalyptic number.

It is an amenable number.

804078080921 is a deficient number, since it is larger than the sum of its proper divisors (1).

804078080921 is an equidigital number, since it uses as much as digits as its factorization.

804078080921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 47.

The spelling of 804078080921 in words is "eight hundred four billion, seventy-eight million, eighty thousand, nine hundred twenty-one".