2082821 has 4 divisors (see below), whose sum is σ = 2243052. Its totient is φ = 1922592.

The previous prime is 2082803. The next prime is 2082827. The reversal of 2082821 is 1282802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 429025 + 1653796 = 655^2 + 1286^2 .

It is a cyclic number.

It is not a de Polignac number, because 2082821 - 2⁶ = 2082757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2082827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80096 + ... + 80121.

It is an arithmetic number, because the mean of its divisors is an integer number (560763).

2^2082821 is an apocalyptic number.

It is an amenable number.

2082821 is a deficient number, since it is larger than the sum of its proper divisors (160231).

2082821 is a wasteful number, since it uses less digits than its factorization.

2082821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160230.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 2082821 is about 1443.1981845887. The cubic root of 2082821 is about 127.7077683842.

The spelling of 2082821 in words is "two million, eighty-two thousand, eight hundred twenty-one".