30304021 has 4 divisors (see below), whose sum is σ = 33058944. Its totient is φ = 27549100.

The previous prime is 30304003. The next prime is 30304091. The reversal of 30304021 is 12040303.

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: 12040303 = 11 ⋅1094573.

It is a cyclic number.

It is not a de Polignac number, because 30304021 - 2⁷ = 30303893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30303992 and 30304010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30304091) 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, 1377445 + ... + 1377466.

It is an arithmetic number, because the mean of its divisors is an integer number (8264736).

Almost surely, 2^30304021 is an apocalyptic number.

It is an amenable number.

30304021 is a deficient number, since it is larger than the sum of its proper divisors (2754923).

30304021 is a wasteful number, since it uses less digits than its factorization.

30304021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2754922.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 30304021 is about 5504.9088094173. The cubic root of 30304021 is about 311.7693513663.

Adding to 30304021 its reverse (12040303), we get a palindrome (42344324).

The spelling of 30304021 in words is "thirty million, three hundred four thousand, twenty-one".