2080821 has 4 divisors (see below), whose sum is σ = 2774432. Its totient is φ = 1387212.

The previous prime is 2080807. The next prime is 2080847. The reversal of 2080821 is 1280802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2080821 - 2¹⁴ = 2064437 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2080801) 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 3 ways as a sum of consecutive naturals, for example, 346801 + ... + 346806.

It is an arithmetic number, because the mean of its divisors is an integer number (693608).

2^2080821 is an apocalyptic number.

It is an amenable number.

2080821 is a deficient number, since it is larger than the sum of its proper divisors (693611).

2080821 is an equidigital number, since it uses as much as digits as its factorization.

2080821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693610.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 2080821 is about 1442.5051126426. The cubic root of 2080821 is about 127.6668787552. Note that the first 3 decimals are identical.

The spelling of 2080821 in words is "two million, eighty thousand, eight hundred twenty-one".