2052821 has 2 divisors, whose sum is σ = 2052822. Its totient is φ = 2052820.

The previous prime is 2052803. The next prime is 2052857. The reversal of 2052821 is 1282502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2044900 + 7921 = 1430^2 + 89^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2052821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2052793 and 2052802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2052521) 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 as a sum of consecutive naturals, namely, 1026410 + 1026411.

It is an arithmetic number, because the mean of its divisors is an integer number (1026411).

2^2052821 is an apocalyptic number.

It is an amenable number.

2052821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2052821 is an equidigital number, since it uses as much as digits as its factorization.

2052821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 2052821 is about 1432.7669035820. The cubic root of 2052821 is about 127.0916526908.

The spelling of 2052821 in words is "two million, fifty-two thousand, eight hundred twenty-one".