1044040021 has 2 divisors, whose sum is σ = 1044040022. Its totient is φ = 1044040020.

The previous prime is 1044040013. The next prime is 1044040051. The reversal of 1044040021 is 1200404401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 650811121 + 393228900 = 25511^2 + 19830^2 .

It is a cyclic number.

It is not a de Polignac number, because 1044040021 - 2³ = 1044040013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1044039977 and 1044040004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1044040051) 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, 522020010 + 522020011.

It is an arithmetic number, because the mean of its divisors is an integer number (522020011).

Almost surely, 2^1044040021 is an apocalyptic number.

It is an amenable number.

1044040021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1044040021 is an equidigital number, since it uses as much as digits as its factorization.

1044040021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1044040021 is about 32311.6081462994. The cubic root of 1044040021 is about 1014.4696270570.

Adding to 1044040021 its reverse (1200404401), we get a palindrome (2244444422).

The spelling of 1044040021 in words is "one billion, forty-four million, forty thousand, twenty-one".