1011001021100 has 216 divisors, whose sum is σ = 2728953273312. Its totient is φ = 323006208000.

The previous prime is 1011001021097. The next prime is 1011001021109. The reversal of 1011001021100 is 11201001101.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1011001021109) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8353217 + ... + 8473383.

It is an arithmetic number, because the mean of its divisors is an integer number (12634042932).

Almost surely, 2^{1011001021100} is an apocalyptic number.

1011001021100 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 1011001021100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1364476636656).

1011001021100 is an abundant number, since it is smaller than the sum of its proper divisors (1717952252212).

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

1011001021100 is a wasteful number, since it uses less digits than its factorization.

1011001021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120313 (or 120299 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 1011001021100 its reverse (11201001101), we get a palindrome (1022202022201).

The spelling of 1011001021100 in words is "one trillion, eleven billion, one million, twenty-one thousand, one hundred".