1004440021 has 16 divisors (see below), whose sum is σ = 1130088960. Its totient is φ = 886426560.

The previous prime is 1004440007. The next prime is 1004440033. The reversal of 1004440021 is 1200444001.

It is a cyclic number.

It is not a de Polignac number, because 1004440021 - 2²⁷ = 870222293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1004439977 and 1004440004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1004440001) 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 15 ways as a sum of consecutive naturals, for example, 18435 + ... + 48463.

It is an arithmetic number, because the mean of its divisors is an integer number (70630560).

Almost surely, 2^1004440021 is an apocalyptic number.

It is an amenable number.

1004440021 is a deficient number, since it is larger than the sum of its proper divisors (125648939).

1004440021 is a wasteful number, since it uses less digits than its factorization.

1004440021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30156.

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

The square root of 1004440021 is about 31692.9017447125. The cubic root of 1004440021 is about 1001.4778219664.

Adding to 1004440021 its reverse (1200444001), we get a palindrome (2204884022).

The spelling of 1004440021 in words is "one billion, four million, four hundred forty thousand, twenty-one".