99911112021 has 12 divisors (see below), whose sum is σ = 164932629472. Its totient is φ = 57092063976.

The previous prime is 99911111987. The next prime is 99911112071. The reversal of 99911112021 is 12021111999.

It is not a de Polignac number, because 99911112021 - 2¹⁰ = 99911110997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99911112071) 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, 792945271 + ... + 792945396.

Almost surely, 2^99911112021 is an apocalyptic number.

It is an amenable number.

99911112021 is a deficient number, since it is larger than the sum of its proper divisors (65021517451).

99911112021 is a wasteful number, since it uses less digits than its factorization.

99911112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585890680 (or 1585890677 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 36.

The spelling of 99911112021 in words is "ninety-nine billion, nine hundred eleven million, one hundred twelve thousand, twenty-one".