99712009521 has 12 divisors (see below), whose sum is σ = 144031804800. Its totient is φ = 66473128440.

The previous prime is 99712009511. The next prime is 99712009541. The reversal of 99712009521 is 12590021799.

It is not a de Polignac number, because 99712009521 - 2¹³ = 99712001329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99712009511) 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, 390280 + ... + 593078.

It is an arithmetic number, because the mean of its divisors is an integer number (12002650400).

Almost surely, 2^99712009521 is an apocalyptic number.

It is an amenable number.

99712009521 is a deficient number, since it is larger than the sum of its proper divisors (44319795279).

99712009521 is a wasteful number, since it uses less digits than its factorization.

99712009521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257436 (or 257433 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 45.

The spelling of 99712009521 in words is "ninety-nine billion, seven hundred twelve million, nine thousand, five hundred twenty-one".