2443223021 has 4 divisors (see below), whose sum is σ = 2443344732. Its totient is φ = 2443101312.

The previous prime is 2443222987. The next prime is 2443223039. The reversal of 2443223021 is 1203223442.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1203223442 = 2 ⋅601611721.

It can be written as a sum of positive squares in 2 ways, for example, as 437437225 + 2005785796 = 20915^2 + 44786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2443223021 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 (2443226021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22820 + ... + 73533.

It is an arithmetic number, because the mean of its divisors is an integer number (610836183).

Almost surely, 2^2443223021 is an apocalyptic number.

It is an amenable number.

2443223021 is a deficient number, since it is larger than the sum of its proper divisors (121711).

2443223021 is an equidigital number, since it uses as much as digits as its factorization.

2443223021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121710.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 2443223021 is about 49428.9694511225. The cubic root of 2443223021 is about 1346.8556028889.

Adding to 2443223021 its reverse (1203223442), we get a palindrome (3646446463).

The spelling of 2443223021 in words is "two billion, four hundred forty-three million, two hundred twenty-three thousand, twenty-one".