2021320043 has 6 divisors (see below), whose sum is σ = 2147215716. Its totient is φ = 1902418592.

The previous prime is 2021320033. The next prime is 2021320061. The reversal of 2021320043 is 3400231202.

It is not a de Polignac number, because 2021320043 - 2¹⁰ = 2021319019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021320033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3496805 + ... + 3497382.

It is an arithmetic number, because the mean of its divisors is an integer number (357869286).

Almost surely, 2^2021320043 is an apocalyptic number.

2021320043 is a deficient number, since it is larger than the sum of its proper divisors (125895673).

2021320043 is an equidigital number, since it uses as much as digits as its factorization.

2021320043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6994221 (or 6994204 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 2021320043 is about 44959.0929957445. The cubic root of 2021320043 is about 1264.3821638838.

Adding to 2021320043 its reverse (3400231202), we get a palindrome (5421551245).

The spelling of 2021320043 in words is "two billion, twenty-one million, three hundred twenty thousand, forty-three".