30105021 has 8 divisors (see below), whose sum is σ = 40406464. Its totient is φ = 19936800.

The previous prime is 30104989. The next prime is 30105059. The reversal of 30105021 is 12050103.

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

It is not a de Polignac number, because 30105021 - 2⁵ = 30104989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30104988 and 30105006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30105071) 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 7 ways as a sum of consecutive naturals, for example, 32776 + ... + 33681.

It is an arithmetic number, because the mean of its divisors is an integer number (5050808).

Almost surely, 2^30105021 is an apocalyptic number.

It is an amenable number.

30105021 is a deficient number, since it is larger than the sum of its proper divisors (10301443).

30105021 is a wasteful number, since it uses less digits than its factorization.

30105021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66611.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 30105021 is about 5486.8042611342. The cubic root of 30105021 is about 311.0854112794.

Adding to 30105021 its reverse (12050103), we get a palindrome (42155124).

The spelling of 30105021 in words is "thirty million, one hundred five thousand, twenty-one".