1004443421 has 2 divisors, whose sum is σ = 1004443422. Its totient is φ = 1004443420.

The previous prime is 1004443399. The next prime is 1004443423. The reversal of 1004443421 is 1243444001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 996664900 + 7778521 = 31570^2 + 2789^2 .

It is an emirp because it is prime and its reverse (1243444001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1004443421 - 2⁶ = 1004443357 is a prime.

Together with 1004443423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1004443423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502221710 + 502221711.

It is an arithmetic number, because the mean of its divisors is an integer number (502221711).

Almost surely, 2^1004443421 is an apocalyptic number.

It is an amenable number.

1004443421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1004443421 is an equidigital number, since it uses as much as digits as its factorization.

1004443421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1004443421 is about 31692.9553844384. The cubic root of 1004443421 is about 1001.4789519561.

Adding to 1004443421 its reverse (1243444001), we get a palindrome (2247887422).

The spelling of 1004443421 in words is "one billion, four million, four hundred forty-three thousand, four hundred twenty-one".