5204105256721 has 24 divisors (see below), whose sum is σ = 6131836751976. Its totient is φ = 4403389939200.

The previous prime is 5204105256631. The next prime is 5204105256817. The reversal of 5204105256721 is 1276525014025.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 212281347600 + 4991823909121 = 460740^2 + 2234239^2 .

It is not a de Polignac number, because 5204105256721 - 2²⁹ = 5203568385809 is a prime.

It is a super-2 number, since 2×5204105256721² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5204105256221) 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 in 23 ways as a sum of consecutive naturals, for example, 107655 + ... + 3227971.

It is an arithmetic number, because the mean of its divisors is an integer number (255493197999).

Almost surely, 2^{5204105256721} is an apocalyptic number.

It is an amenable number.

5204105256721 is a deficient number, since it is larger than the sum of its proper divisors (927731495255).

5204105256721 is a wasteful number, since it uses less digits than its factorization.

5204105256721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3120769 (or 3120762 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 40.

The spelling of 5204105256721 in words is "five trillion, two hundred four billion, one hundred five million, two hundred fifty-six thousand, seven hundred twenty-one".