11505120121100 has 18 divisors (see below), whose sum is σ = 24966110663004. Its totient is φ = 4602048048400.

The previous prime is 11505120121097. The next prime is 11505120121139. The reversal of 11505120121100 is 112102150511.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 57525600506 + ... + 57525600705.

Almost surely, 2^{11505120121100} is an apocalyptic number.

11505120121100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11505120121100 is an abundant number, since it is smaller than the sum of its proper divisors (13460990541904).

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

11505120121100 is a wasteful number, since it uses less digits than its factorization.

11505120121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115051201225 (or 115051201218 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 20.

Adding to 11505120121100 its reverse (112102150511), we get a palindrome (11617222271611).

The spelling of 11505120121100 in words is "eleven trillion, five hundred five billion, one hundred twenty million, one hundred twenty-one thousand, one hundred".