12100111998 has 128 divisors (see below), whose sum is σ = 29575590912. Its totient is φ = 3260860416.

The previous prime is 12100111973. The next prime is 12100112027. The reversal of 12100111998 is 89911100121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1123065 + ... + 1133787.

It is an arithmetic number, because the mean of its divisors is an integer number (231059304).

Almost surely, 2^12100111998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12100111998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14787795456).

12100111998 is an abundant number, since it is smaller than the sum of its proper divisors (17475478914).

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

12100111998 is a wasteful number, since it uses less digits than its factorization.

12100111998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10818.

The product of its (nonzero) digits is 1296, while the sum is 33.

The spelling of 12100111998 in words is "twelve billion, one hundred million, one hundred eleven thousand, nine hundred ninety-eight".