2822821 has 4 divisors (see below), whose sum is σ = 2888512. Its totient is φ = 2757132.

The previous prime is 2822819. The next prime is 2822851. The reversal of 2822821 is 1282282.

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 2822821 - 2¹ = 2822819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2822851) 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, 32781 + ... + 32866.

It is an arithmetic number, because the mean of its divisors is an integer number (722128).

2^2822821 is an apocalyptic number.

It is an amenable number.

2822821 is a deficient number, since it is larger than the sum of its proper divisors (65691).

2822821 is an equidigital number, since it uses as much as digits as its factorization.

2822821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65690.

The product of its digits is 1024, while the sum is 25.

The square root of 2822821 is about 1680.1252929469. The cubic root of 2822821 is about 141.3278590251.

The spelling of 2822821 in words is "two million, eight hundred twenty-two thousand, eight hundred twenty-one".