1004020321 has 2 divisors, whose sum is σ = 1004020322. Its totient is φ = 1004020320.

The previous prime is 1004020307. The next prime is 1004020327. The reversal of 1004020321 is 1230204001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 907214400 + 96805921 = 30120^2 + 9839^2 .

It is a cyclic number.

It is not a de Polignac number, because 1004020321 - 2²³ = 995631713 is a prime.

It is not a weakly prime, because it can be changed into another prime (1004020327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502010160 + 502010161.

It is an arithmetic number, because the mean of its divisors is an integer number (502010161).

Almost surely, 2^1004020321 is an apocalyptic number.

It is an amenable number.

1004020321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1004020321 is an equidigital number, since it uses as much as digits as its factorization.

1004020321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1004020321 is about 31686.2796964238. The cubic root of 1004020321 is about 1001.3383151136.

Adding to 1004020321 its reverse (1230204001), we get a palindrome (2234224322).

The spelling of 1004020321 in words is "one billion, four million, twenty thousand, three hundred twenty-one".