9991212120112 has 10 divisors (see below), whose sum is σ = 19357973482748. Its totient is φ = 4995606060048.

The previous prime is 9991212120091. The next prime is 9991212120121. The reversal of 9991212120112 is 2110212121999.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312225378738 + ... + 312225378769.

Almost surely, 2^{9991212120112} is an apocalyptic number.

It is an amenable number.

9991212120112 is a deficient number, since it is larger than the sum of its proper divisors (9366761362636).

9991212120112 is a wasteful number, since it uses less digits than its factorization.

9991212120112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624450757515 (or 624450757509 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 40.

The spelling of 9991212120112 in words is "nine trillion, nine hundred ninety-one billion, two hundred twelve million, one hundred twenty thousand, one hundred twelve".