2708821 has 2 divisors, whose sum is σ = 2708822. Its totient is φ = 2708820.

The previous prime is 2708819. The next prime is 2708833. The reversal of 2708821 is 1288072.

2708821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2686321 + 22500 = 1639^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 2708821 - 2¹ = 2708819 is a prime.

It is a super-2 number, since 2×2708821² = 14675422420082, which contains 22 as substring.

Together with 2708819, it forms a pair of twin primes.

It is a nialpdrome in base 4 and base 12.

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 2708821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2708801) 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 as a sum of consecutive naturals, namely, 1354410 + 1354411.

It is an arithmetic number, because the mean of its divisors is an integer number (1354411).

2^2708821 is an apocalyptic number.

It is an amenable number.

2708821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2708821 is an equidigital number, since it uses as much as digits as its factorization.

2708821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 2708821 is about 1645.8496286113. The cubic root of 2708821 is about 139.3991425933.

The spelling of 2708821 in words is "two million, seven hundred eight thousand, eight hundred twenty-one".