30328021 has 8 divisors (see below), whose sum is σ = 30821120. Its totient is φ = 29837808.

The previous prime is 30328003. The next prime is 30328027. The reversal of 30328021 is 12082303.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30328021 - 2⁵ = 30327989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30328021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30328027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30880 + ... + 31846.

It is an arithmetic number, because the mean of its divisors is an integer number (3852640).

Almost surely, 2^30328021 is an apocalyptic number.

It is an amenable number.

30328021 is a deficient number, since it is larger than the sum of its proper divisors (493099).

30328021 is an equidigital number, since it uses as much as digits as its factorization.

30328021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 30328021 is about 5507.0882506094. The cubic root of 30328021 is about 311.8516340662.

The spelling of 30328021 in words is "thirty million, three hundred twenty-eight thousand, twenty-one".