2820822821 has 4 divisors (see below), whose sum is σ = 2969287200. Its totient is φ = 2672358444.

The previous prime is 2820822799. The next prime is 2820822887. The reversal of 2820822821 is 1282280282.

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 2820822821 - 2⁶ = 2820822757 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 (2820828821) 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, 74232161 + ... + 74232198.

It is an arithmetic number, because the mean of its divisors is an integer number (742321800).

Almost surely, 2^2820822821 is an apocalyptic number.

It is an amenable number.

2820822821 is a deficient number, since it is larger than the sum of its proper divisors (148464379).

2820822821 is a wasteful number, since it uses less digits than its factorization.

2820822821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148464378.

The product of its (nonzero) digits is 16384, while the sum is 35.

The square root of 2820822821 is about 53111.4189322786. The cubic root of 2820822821 is about 1412.9450409171.

The spelling of 2820822821 in words is "two billion, eight hundred twenty million, eight hundred twenty-two thousand, eight hundred twenty-one".