99171212412 has 96 divisors (see below), whose sum is σ = 246789752832. Its totient is φ = 30922963456.

The previous prime is 99171212381. The next prime is 99171212429. The reversal of 99171212412 is 21421217199.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24346408 + ... + 24350480.

It is an arithmetic number, because the mean of its divisors is an integer number (2570726592).

Almost surely, 2^99171212412 is an apocalyptic number.

99171212412 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99171212412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123394876416).

99171212412 is an abundant number, since it is smaller than the sum of its proper divisors (147618540420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99171212412 is a wasteful number, since it uses less digits than its factorization.

99171212412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6027 (or 6025 counting only the distinct ones).

The product of its digits is 18144, while the sum is 39.

The spelling of 99171212412 in words is "ninety-nine billion, one hundred seventy-one million, two hundred twelve thousand, four hundred twelve".