30338921 has 4 divisors (see below), whose sum is σ = 30853200. Its totient is φ = 29824644.

The previous prime is 30338911. The next prime is 30338929. The reversal of 30338921 is 12983303.

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: 12983303 = 193 ⋅67271.

It is a cyclic number.

It is not a de Polignac number, because 30338921 - 2⁶ = 30338857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30338929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257051 + ... + 257168.

It is an arithmetic number, because the mean of its divisors is an integer number (7713300).

Almost surely, 2^30338921 is an apocalyptic number.

It is an amenable number.

30338921 is a deficient number, since it is larger than the sum of its proper divisors (514279).

30338921 is an equidigital number, since it uses as much as digits as its factorization.

30338921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514278.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 30338921 is about 5508.0777953838. The cubic root of 30338921 is about 311.8889897915. Note that the first 3 decimals are identical.

The spelling of 30338921 in words is "thirty million, three hundred thirty-eight thousand, nine hundred twenty-one".