9999130521 has 4 divisors (see below), whose sum is σ = 13332174032. Its totient is φ = 6666087012.

The previous prime is 9999130489. The next prime is 9999130577. The reversal of 9999130521 is 1250319999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 9999130521 - 2⁵ = 9999130489 is a prime.

It is a super-2 number, since 2×9999130521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9999130121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1666521751 + ... + 1666521756.

It is an arithmetic number, because the mean of its divisors is an integer number (3333043508).

Almost surely, 2^9999130521 is an apocalyptic number.

It is an amenable number.

9999130521 is a deficient number, since it is larger than the sum of its proper divisors (3333043511).

9999130521 is a wasteful number, since it uses less digits than its factorization.

9999130521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333043510.

The product of its (nonzero) digits is 196830, while the sum is 48.

The square root of 9999130521 is about 99995.6525104967. The cubic root of 9999130521 is about 2154.3722470314.

The spelling of 9999130521 in words is "nine billion, nine hundred ninety-nine million, one hundred thirty thousand, five hundred twenty-one".