9912919521 has 16 divisors (see below), whose sum is σ = 14010551424. Its totient is φ = 6212830464.

The previous prime is 9912919483. The next prime is 9912919529. The reversal of 9912919521 is 1259192199.

It is not a de Polignac number, because 9912919521 - 2¹⁷ = 9912788449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9912919529) 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, 64330 + ... + 154803.

It is an arithmetic number, because the mean of its divisors is an integer number (875659464).

Almost surely, 2^9912919521 is an apocalyptic number.

It is an amenable number.

9912919521 is a deficient number, since it is larger than the sum of its proper divisors (4097631903).

9912919521 is a wasteful number, since it uses less digits than its factorization.

9912919521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220040.

The product of its digits is 131220, while the sum is 48.

The square root of 9912919521 is about 99563.6455790968. The cubic root of 9912919521 is about 2148.1628092093.

The spelling of 9912919521 in words is "nine billion, nine hundred twelve million, nine hundred nineteen thousand, five hundred twenty-one".