2021212443 has 4 divisors (see below), whose sum is σ = 2694949928. Its totient is φ = 1347474960.

The previous prime is 2021212441. The next prime is 2021212447. The reversal of 2021212443 is 3442121202.

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

It is not a de Polignac number, because 2021212443 - 2¹ = 2021212441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021212441) 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, 336868738 + ... + 336868743.

It is an arithmetic number, because the mean of its divisors is an integer number (673737482).

Almost surely, 2^2021212443 is an apocalyptic number.

2021212443 is a deficient number, since it is larger than the sum of its proper divisors (673737485).

2021212443 is an equidigital number, since it uses as much as digits as its factorization.

2021212443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673737484.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 2021212443 is about 44957.8963364613. The cubic root of 2021212443 is about 1264.3597280610.

Adding to 2021212443 its reverse (3442121202), we get a palindrome (5463333645).

The spelling of 2021212443 in words is "two billion, twenty-one million, two hundred twelve thousand, four hundred forty-three".