1004003421 has 4 divisors (see below), whose sum is σ = 1338671232. Its totient is φ = 669335612.

The previous prime is 1004003419. The next prime is 1004003423. The reversal of 1004003421 is 1243004001.

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: 1243004001 = 3 ⋅414334667.

It is an interprime number because it is at equal distance from previous prime (1004003419) and next prime (1004003423).

It is a cyclic number.

It is not a de Polignac number, because 1004003421 - 2¹ = 1004003419 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1004003421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1004003423) 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, 167333901 + ... + 167333906.

It is an arithmetic number, because the mean of its divisors is an integer number (334667808).

Almost surely, 2^1004003421 is an apocalyptic number.

It is an amenable number.

1004003421 is a deficient number, since it is larger than the sum of its proper divisors (334667811).

1004003421 is an equidigital number, since it uses as much as digits as its factorization.

1004003421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334667810.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1004003421 is about 31686.0130183651. The cubic root of 1004003421 is about 1001.3326967969.

Adding to 1004003421 its reverse (1243004001), we get a palindrome (2247007422).

The spelling of 1004003421 in words is "one billion, four million, three thousand, four hundred twenty-one".