100001111128 has 8 divisors (see below), whose sum is σ = 187502083380. Its totient is φ = 50000555560.

The previous prime is 100001111057. The next prime is 100001111129. The reversal of 100001111128 is 821111100001.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100001111129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6250069438 + ... + 6250069453.

Almost surely, 2^100001111128 is an apocalyptic number.

It is an amenable number.

100001111128 is a deficient number, since it is larger than the sum of its proper divisors (87500972252).

100001111128 is a wasteful number, since it uses less digits than its factorization.

100001111128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12500138897 (or 12500138893 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 100001111128 its reverse (821111100001), we get a palindrome (921112211129).

The spelling of 100001111128 in words is "one hundred billion, one million, one hundred eleven thousand, one hundred twenty-eight".