2065821 has 12 divisors (see below), whose sum is σ = 2836512. Its totient is φ = 1337328.

The previous prime is 2065807. The next prime is 2065829. The reversal of 2065821 is 1285602.

It is not a de Polignac number, because 2065821 - 2⁹ = 2065309 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2065791 and 2065800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2065829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3856 + ... + 4358.

It is an arithmetic number, because the mean of its divisors is an integer number (236376).

2^2065821 is an apocalyptic number.

It is an amenable number.

2065821 is a deficient number, since it is larger than the sum of its proper divisors (770691).

2065821 is an equidigital number, since it uses as much as digits as its factorization.

2065821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580 (or 543 counting only the distinct ones).

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

The square root of 2065821 is about 1437.2964203671. The cubic root of 2065821 is about 127.3593682012.

The spelling of 2065821 in words is "two million, sixty-five thousand, eight hundred twenty-one".