2021543 has 4 divisors (see below), whose sum is σ = 2127960. Its totient is φ = 1915128.

The previous prime is 2021533. The next prime is 2021549. The reversal of 2021543 is 3451202.

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 2021543 - 2⁴ = 2021527 is a prime.

It is a super-2 number, since 2×2021543² = 8173272201698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021549) 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, 53180 + ... + 53217.

It is an arithmetic number, because the mean of its divisors is an integer number (531990).

2^2021543 is an apocalyptic number.

2021543 is a deficient number, since it is larger than the sum of its proper divisors (106417).

2021543 is a wasteful number, since it uses less digits than its factorization.

2021543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106416.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 2021543 is about 1421.8097622397. The cubic root of 2021543 is about 126.4428650418.

Adding to 2021543 its reverse (3451202), we get a palindrome (5472745).

The spelling of 2021543 in words is "two million, twenty-one thousand, five hundred forty-three".