1004224021 has 4 divisors (see below), whose sum is σ = 1027578112. Its totient is φ = 980869932.

The previous prime is 1004224009. The next prime is 1004224057. The reversal of 1004224021 is 1204224001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1204224001 = 271 ⋅4443631.

It is a cyclic number.

It is not a de Polignac number, because 1004224021 - 2²⁹ = 467353109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1004223986 and 1004224004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1004224061) 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 3 ways as a sum of consecutive naturals, for example, 11676981 + ... + 11677066.

It is an arithmetic number, because the mean of its divisors is an integer number (256894528).

Almost surely, 2^1004224021 is an apocalyptic number.

It is an amenable number.

1004224021 is a deficient number, since it is larger than the sum of its proper divisors (23354091).

1004224021 is an equidigital number, since it uses as much as digits as its factorization.

1004224021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23354090.

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

The square root of 1004224021 is about 31689.4938583752. The cubic root of 1004224021 is about 1001.4060291555.

Adding to 1004224021 its reverse (1204224001), we get a palindrome (2208448022).

The spelling of 1004224021 in words is "one billion, four million, two hundred twenty-four thousand, twenty-one".