2820442921 has 4 divisors (see below), whose sum is σ = 2862539152. Its totient is φ = 2778346692.

The previous prime is 2820442901. The next prime is 2820442927. The reversal of 2820442921 is 1292440282.

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 a de Polignac number, because none of the positive numbers 2^k-2820442921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2820442927) 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, 21048015 + ... + 21048148.

It is an arithmetic number, because the mean of its divisors is an integer number (715634788).

Almost surely, 2^2820442921 is an apocalyptic number.

It is an amenable number.

2820442921 is a deficient number, since it is larger than the sum of its proper divisors (42096231).

2820442921 is an equidigital number, since it uses as much as digits as its factorization.

2820442921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42096230.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 2820442921 is about 53107.8423681475. The cubic root of 2820442921 is about 1412.8816076621.

The spelling of 2820442921 in words is "two billion, eight hundred twenty million, four hundred forty-two thousand, nine hundred twenty-one".