2021443 has 4 divisors (see below), whose sum is σ = 2049208. Its totient is φ = 1993680.

The previous prime is 2021431. The next prime is 2021471. The reversal of 2021443 is 3441202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2021443 - 2¹³ = 2013251 is a prime.

It is a super-4 number, since 4×2021443⁴ (a number of 26 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021143) 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 in 3 ways as a sum of consecutive naturals, for example, 13773 + ... + 13918.

It is an arithmetic number, because the mean of its divisors is an integer number (512302).

2^2021443 is an apocalyptic number.

2021443 is a deficient number, since it is larger than the sum of its proper divisors (27765).

2021443 is an equidigital number, since it uses as much as digits as its factorization.

2021443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27764.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 2021443 is about 1421.7745953561. The cubic root of 2021443 is about 126.4407800841.

Adding to 2021443 its reverse (3441202), we get a palindrome (5462645).

The spelling of 2021443 in words is "two million, twenty-one thousand, four hundred forty-three".