2021212543 has 4 divisors (see below), whose sum is σ = 2309957200. Its totient is φ = 1732467888.

The previous prime is 2021212541. The next prime is 2021212577. The reversal of 2021212543 is 3452121202.

It is a happy number.

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 2021212543 - 2¹ = 2021212541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021212541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144372318 + ... + 144372331.

It is an arithmetic number, because the mean of its divisors is an integer number (577489300).

Almost surely, 2^2021212543 is an apocalyptic number.

2021212543 is a deficient number, since it is larger than the sum of its proper divisors (288744657).

2021212543 is an equidigital number, since it uses as much as digits as its factorization.

2021212543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288744656.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 2021212543 is about 44957.8974486130. The cubic root of 2021212543 is about 1264.3597489125.

Adding to 2021212543 its reverse (3452121202), we get a palindrome (5473333745).

The spelling of 2021212543 in words is "two billion, twenty-one million, two hundred twelve thousand, five hundred forty-three".