30168921 has 8 divisors (see below), whose sum is σ = 41522944. Its totient is φ = 19463760.

The previous prime is 30168913. The next prime is 30168947. The reversal of 30168921 is 12986103.

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

It is not a de Polignac number, because 30168921 - 2³ = 30168913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30168821) 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, 162106 + ... + 162291.

It is an arithmetic number, because the mean of its divisors is an integer number (5190368).

Almost surely, 2^30168921 is an apocalyptic number.

30168921 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

30168921 is a deficient number, since it is larger than the sum of its proper divisors (11354023).

30168921 is a wasteful number, since it uses less digits than its factorization.

30168921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324431.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 30168921 is about 5492.6242361917. The cubic root of 30168921 is about 311.3053558743.

The spelling of 30168921 in words is "thirty million, one hundred sixty-eight thousand, nine hundred twenty-one".