9930205521 has 12 divisors (see below), whose sum is σ = 14731296372. Its totient is φ = 6441214176.

The previous prime is 9930205517. The next prime is 9930205531. The reversal of 9930205521 is 1255020399.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8987040000 + 943165521 = 94800^2 + 30711^2 .

It is not a de Polignac number, because 9930205521 - 2² = 9930205517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9930205501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14909886 + ... + 14910551.

It is an arithmetic number, because the mean of its divisors is an integer number (1227608031).

Almost surely, 2^9930205521 is an apocalyptic number.

It is an amenable number.

9930205521 is a deficient number, since it is larger than the sum of its proper divisors (4801090851).

9930205521 is a wasteful number, since it uses less digits than its factorization.

9930205521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29820480 (or 29820477 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 9930205521 is about 99650.4165620997. The cubic root of 9930205521 is about 2149.4107287906.

The spelling of 9930205521 in words is "nine billion, nine hundred thirty million, two hundred five thousand, five hundred twenty-one".