1304130021 has 16 divisors (see below), whose sum is σ = 1760529408. Its totient is φ = 858639600.

The previous prime is 1304130019. The next prime is 1304130049. The reversal of 1304130021 is 1200314031.

It is not a de Polignac number, because 1304130021 - 2¹ = 1304130019 is a prime.

It is a super-2 number, since 2×1304130021² = 3401510223346920882, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304132021) 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 15 ways as a sum of consecutive naturals, for example, 75060 + ... + 90786.

It is an arithmetic number, because the mean of its divisors is an integer number (110033088).

Almost surely, 2^1304130021 is an apocalyptic number.

It is an amenable number.

1304130021 is a deficient number, since it is larger than the sum of its proper divisors (456399387).

1304130021 is a wasteful number, since it uses less digits than its factorization.

1304130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16072.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1304130021 is about 36112.7404249525. The cubic root of 1304130021 is about 1092.5474242426.

Adding to 1304130021 its reverse (1200314031), we get a palindrome (2504444052).

The spelling of 1304130021 in words is "one billion, three hundred four million, one hundred thirty thousand, twenty-one".