2021220543 has 16 divisors (see below), whose sum is σ = 2742012000. Its totient is φ = 1324001280.

The previous prime is 2021220529. The next prime is 2021220581. The reversal of 2021220543 is 3450221202.

It is not a de Polignac number, because 2021220543 - 2¹³ = 2021212351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021220043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186703 + ... + 197231.

It is an arithmetic number, because the mean of its divisors is an integer number (171375750).

Almost surely, 2^2021220543 is an apocalyptic number.

2021220543 is a deficient number, since it is larger than the sum of its proper divisors (720791457).

2021220543 is a wasteful number, since it uses less digits than its factorization.

2021220543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11642.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 2021220543 is about 44957.9864206572. The cubic root of 2021220543 is about 1264.3614170308.

Adding to 2021220543 its reverse (3450221202), we get a palindrome (5471441745).

It can be divided in two parts, 20212 and 20543, that added together give a triangular number (40755 = T₂₈₅).

The spelling of 2021220543 in words is "two billion, twenty-one million, two hundred twenty thousand, five hundred forty-three".