4044041021 has 2 divisors, whose sum is σ = 4044041022. Its totient is φ = 4044041020.

The previous prime is 4044040993. The next prime is 4044041063. The reversal of 4044041021 is 1201404404.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2653795225 + 1390245796 = 51515^2 + 37286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4044041021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4044040984 and 4044041002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4044041621) 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 as a sum of consecutive naturals, namely, 2022020510 + 2022020511.

It is an arithmetic number, because the mean of its divisors is an integer number (2022020511).

Almost surely, 2^4044041021 is an apocalyptic number.

It is an amenable number.

4044041021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4044041021 is an equidigital number, since it uses as much as digits as its factorization.

4044041021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 4044041021 is about 63592.7749119348. The cubic root of 4044041021 is about 1593.2056971874.

Adding to 4044041021 its reverse (1201404404), we get a palindrome (5245445425).

The spelling of 4044041021 in words is "four billion, forty-four million, forty-one thousand, twenty-one".