2010821 has 4 divisors (see below), whose sum is σ = 2098272. Its totient is φ = 1923372.

The previous prime is 2010733. The next prime is 2010881. The reversal of 2010821 is 1280102.

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 a cyclic number.

It is not a de Polignac number, because 2010821 - 2¹⁴ = 1994437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2010796 and 2010805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2010881) 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 3 ways as a sum of consecutive naturals, for example, 43691 + ... + 43736.

It is an arithmetic number, because the mean of its divisors is an integer number (524568).

2^2010821 is an apocalyptic number.

It is an amenable number.

2010821 is a deficient number, since it is larger than the sum of its proper divisors (87451).

2010821 is an equidigital number, since it uses as much as digits as its factorization.

2010821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87450.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2010821 is about 1418.0342026905. The cubic root of 2010821 is about 126.2189231747.

Adding to 2010821 its reverse (1280102), we get a palindrome (3290923).

The spelling of 2010821 in words is "two million, ten thousand, eight hundred twenty-one".