1001100111111 has 40 divisors (see below), whose sum is σ = 1510932225264.
Its totient is φ = 660527187840.
The previous prime is 1001100111107. The next prime is 1001100111113. The reversal of 1001100111111 is 1111110011001.
Adding to 1001100111111 its reverse (1111110011001), we get a palindrome (2112210122112).
It can be divided in two parts, 10011001 and 11111, that multiplied together give a palindrome (111232232111).
It is not a de Polignac number, because 1001100111111 - 22 = 1001100111107 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (9).
It is a junction number, because it is equal to n+sod(n) for n = 1001100111093 and 1001100111102.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1001100111113) by changing a digit.
It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3831435 + ... + 4084371.
Almost surely, 21001100111111 is an apocalyptic number.
1001100111111 is a deficient number, since it is larger than the sum of its proper divisors (509832114153).
1001100111111 is a wasteful number, since it uses less digits than its factorization.
1001100111111 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 253453 (or 253444 counting only the distinct ones).
The product of its (nonzero) digits is 1, while the sum is 9.
The spelling of 1001100111111 in words is "one trillion, one billion, one hundred million, one hundred eleven thousand, one hundred eleven".