4043442331021 has 4 divisors (see below), whose sum is σ = 4043446980444. Its totient is φ = 4043437681600.

The previous prime is 4043442330953. The next prime is 4043442331099. The reversal of 4043442331021 is 1201332443404.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 885695560996 + 3157746770025 = 941114^2 + 1777005^2 .

It is a cyclic number.

It is not a de Polignac number, because 4043442331021 - 2¹¹ = 4043442328973 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 (4043442331421) 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, 587470 + ... + 2903791.

It is an arithmetic number, because the mean of its divisors is an integer number (1010861745111).

Almost surely, 2^{4043442331021} is an apocalyptic number.

It is an amenable number.

4043442331021 is a deficient number, since it is larger than the sum of its proper divisors (4649423).

4043442331021 is a wasteful number, since it uses less digits than its factorization.

4043442331021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4649422.

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 4043442331021 its reverse (1201332443404), we get a palindrome (5244774774425).

The spelling of 4043442331021 in words is "four trillion, forty-three billion, four hundred forty-two million, three hundred thirty-one thousand, twenty-one".