30105521 has 16 divisors (see below), whose sum is σ = 33384960. Its totient is φ = 27025920.

The previous prime is 30105499. The next prime is 30105529. The reversal of 30105521 is 12550103.

It is not a de Polignac number, because 30105521 - 2¹⁸ = 29843377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 30105521.

It is not an unprimeable number, because it can be changed into a prime (30105529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32300 + ... + 33218.

It is an arithmetic number, because the mean of its divisors is an integer number (2086560).

Almost surely, 2^30105521 is an apocalyptic number.

It is an amenable number.

30105521 is a deficient number, since it is larger than the sum of its proper divisors (3279439).

30105521 is a wasteful number, since it uses less digits than its factorization.

30105521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 30105521 is about 5486.8498248084. The cubic root of 30105521 is about 311.0871334932.

Adding to 30105521 its reverse (12550103), we get a palindrome (42655624).

The spelling of 30105521 in words is "thirty million, one hundred five thousand, five hundred twenty-one".