11111100121020 has 48 divisors (see below), whose sum is σ = 31111731090720. Its totient is φ = 2962898055936.

The previous prime is 11111100121003. The next prime is 11111100121087. The reversal of 11111100121020 is 2012100111111.

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

It is a junction number, because it is equal to n+sod(n) for n = 11111100120987 and 11111100121005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 992226 + ... + 4817334.

It is an arithmetic number, because the mean of its divisors is an integer number (648161064390).

Almost surely, 2^{11111100121020} is an apocalyptic number.

11111100121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111100121020 is an abundant number, since it is smaller than the sum of its proper divisors (20000630969700).

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

11111100121020 is a wasteful number, since it uses less digits than its factorization.

11111100121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3873534 (or 3873532 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 11111100121020 its reverse (2012100111111), we get a palindrome (13123200232131).

Subtracting from 11111100121020 its reverse (2012100111111), we obtain a palindrome (9099000009909).

The spelling of 11111100121020 in words is "eleven trillion, one hundred eleven billion, one hundred million, one hundred twenty-one thousand, twenty".