1044240021 has 12 divisors (see below), whose sum is σ = 1645469280. Its totient is φ = 632872680.

The previous prime is 1044239969. The next prime is 1044240037. The reversal of 1044240021 is 1200424401.

It is not a de Polignac number, because 1044240021 - 2⁹ = 1044239509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1044239976 and 1044240003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1044240721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5273841 + ... + 5274038.

It is an arithmetic number, because the mean of its divisors is an integer number (137122440).

Almost surely, 2^1044240021 is an apocalyptic number.

1044240021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1044240021 is a deficient number, since it is larger than the sum of its proper divisors (601229259).

1044240021 is a wasteful number, since it uses less digits than its factorization.

1044240021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10547896 (or 10547893 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1044240021 is about 32314.7028610817. The cubic root of 1044240021 is about 1014.5344013847.

Adding to 1044240021 its reverse (1200424401), we get a palindrome (2244664422).

The spelling of 1044240021 in words is "one billion, forty-four million, two hundred forty thousand, twenty-one".