304130021 has 16 divisors (see below), whose sum is σ = 331296000. Its totient is φ = 277525440.

The previous prime is 304130003. The next prime is 304130053. The reversal of 304130021 is 120031403.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-304130021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 304129978 and 304130005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (304135021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 609230 + ... + 609728.

It is an arithmetic number, because the mean of its divisors is an integer number (20706000).

Almost surely, 2^304130021 is an apocalyptic number.

It is an amenable number.

304130021 is a deficient number, since it is larger than the sum of its proper divisors (27165979).

304130021 is a wasteful number, since it uses less digits than its factorization.

304130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 304130021 is about 17439.3239834576. The cubic root of 304130021 is about 672.4909289693.

Adding to 304130021 its reverse (120031403), we get a palindrome (424161424).

The spelling of 304130021 in words is "three hundred four million, one hundred thirty thousand, twenty-one".