1004001321 has 4 divisors (see below), whose sum is σ = 1338668432. Its totient is φ = 669334212.

The previous prime is 1004001319. The next prime is 1004001331. The reversal of 1004001321 is 1231004001.

It is a happy number.

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: 1231004001 = 3 ⋅410334667.

It is not a de Polignac number, because 1004001321 - 2¹ = 1004001319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1004001297 and 1004001306.

It is not an unprimeable number, because it can be changed into a prime (1004001301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167333551 + ... + 167333556.

It is an arithmetic number, because the mean of its divisors is an integer number (334667108).

Almost surely, 2^1004001321 is an apocalyptic number.

It is an amenable number.

1004001321 is a deficient number, since it is larger than the sum of its proper divisors (334667111).

1004001321 is an equidigital number, since it uses as much as digits as its factorization.

1004001321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334667110.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1004001321 is about 31685.9798806980. The cubic root of 1004001321 is about 1001.3319986585.

Adding to 1004001321 its reverse (1231004001), we get a palindrome (2235005322).

The spelling of 1004001321 in words is "one billion, four million, one thousand, three hundred twenty-one".