30000021 has 8 divisors (see below), whose sum is σ = 40046304. Its totient is φ = 19976880.

The previous prime is 30000001. The next prime is 30000023. The reversal of 30000021 is 12000003.

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

It is not a de Polignac number, because 30000021 - 2⁵ = 29999989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 29999964 and 30000009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30000023) 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 7 ways as a sum of consecutive naturals, for example, 2491 + ... + 8136.

It is an arithmetic number, because the mean of its divisors is an integer number (5005788).

Almost surely, 2^30000021 is an apocalyptic number.

It is an amenable number.

30000021 is a deficient number, since it is larger than the sum of its proper divisors (10046283).

30000021 is a wasteful number, since it uses less digits than its factorization.

30000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11571.

The product of its (nonzero) digits is 6, while the sum is 6.

The square root of 30000021 is about 5477.2274920803. The cubic root of 30000021 is about 310.7233230975.

Adding to 30000021 its reverse (12000003), we get a palindrome (42000024).

It can be divided in two parts, 3000002 and 1, that added together give a palindrome (3000003).

The spelling of 30000021 in words is "thirty million, twenty-one", and thus it is an aban number and an uban number.