1004320021 has 2 divisors, whose sum is σ = 1004320022. Its totient is φ = 1004320020.

The previous prime is 1004319977. The next prime is 1004320027. The reversal of 1004320021 is 1200234001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529690225 + 474629796 = 23015^2 + 21786^2 .

It is a cyclic number.

It is not a de Polignac number, because 1004320021 - 2⁷ = 1004319893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1004319983 and 1004320010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1004320027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502160010 + 502160011.

It is an arithmetic number, because the mean of its divisors is an integer number (502160011).

Almost surely, 2^1004320021 is an apocalyptic number.

It is an amenable number.

1004320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1004320021 is an equidigital number, since it uses as much as digits as its factorization.

1004320021 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 1004320021 is about 31691.0085197679. The cubic root of 1004320021 is about 1001.4379383423.

Adding to 1004320021 its reverse (1200234001), we get a palindrome (2204554022).

The spelling of 1004320021 in words is "one billion, four million, three hundred twenty thousand, twenty-one".