1001111321100 has 144 divisors (see below), whose sum is σ = 3165083421696. Its totient is φ = 242293344000.

The previous prime is 1001111321099. The next prime is 1001111321129. The reversal of 1001111321100 is 11231111001.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1753210 + ... + 2252990.

It is an arithmetic number, because the mean of its divisors is an integer number (21979745984).

Almost surely, 2^{1001111321100} is an apocalyptic number.

1001111321100 is a gapful number since it is divisible by the number (10) 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 1001111321100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1582541710848).

1001111321100 is an abundant number, since it is smaller than the sum of its proper divisors (2163972100596).

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

1001111321100 is a wasteful number, since it uses less digits than its factorization.

1001111321100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500416 (or 500409 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 12.

Adding to 1001111321100 its reverse (11231111001), we get a palindrome (1012342432101).

The spelling of 1001111321100 in words is "one trillion, one billion, one hundred eleven million, three hundred twenty-one thousand, one hundred".