2560821 has 8 divisors (see below), whose sum is σ = 3421824. Its totient is φ = 1703520.

The previous prime is 2560793. The next prime is 2560823. The reversal of 2560821 is 1280652.

2560821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2560821 - 2¹⁰ = 2559797 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2560791 and 2560800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2560823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2265 + ... + 3201.

It is an arithmetic number, because the mean of its divisors is an integer number (427728).

2^2560821 is an apocalyptic number.

It is an amenable number.

2560821 is a deficient number, since it is larger than the sum of its proper divisors (861003).

2560821 is an equidigital number, since it uses as much as digits as its factorization.

2560821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 2560821 is about 1600.2565419332. The cubic root of 2560821 is about 136.8126980279.

The spelling of 2560821 in words is "two million, five hundred sixty thousand, eight hundred twenty-one".