804020657121 has 48 divisors (see below), whose sum is σ = 1269920426112. Its totient is φ = 486140928000.

The previous prime is 804020657093. The next prime is 804020657137. The reversal of 804020657121 is 121756020408.

804020657121 is a `hidden beast` number, since 8 + 0 + 40 + 20 + 6 + 571 + 21 = 666.

It is not a de Polignac number, because 804020657121 - 2⁷ = 804020656993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (804020652121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 84870241 + ... + 84879713.

It is an arithmetic number, because the mean of its divisors is an integer number (26456675544).

Almost surely, 2^804020657121 is an apocalyptic number.

It is an amenable number.

804020657121 is a deficient number, since it is larger than the sum of its proper divisors (465899768991).

804020657121 is a wasteful number, since it uses less digits than its factorization.

804020657121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11414 (or 11411 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

Adding to 804020657121 its reverse (121756020408), we get a palindrome (925776677529).

The spelling of 804020657121 in words is "eight hundred four billion, twenty million, six hundred fifty-seven thousand, one hundred twenty-one".