11111221010100 has 288 divisors, whose sum is σ = 32956498204672. Its totient is φ = 2889432000000.

The previous prime is 11111221010077. The next prime is 11111221010119. The reversal of 11111221010100 is 101012211111.

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

It is a congruent number.

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 95 ways as a sum of consecutive naturals, for example, 1511521425 + ... + 1511528775.

Almost surely, 2^{11111221010100} is an apocalyptic number.

11111221010100 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 11111221010100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16478249102336).

11111221010100 is an abundant number, since it is smaller than the sum of its proper divisors (21845277194572).

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

11111221010100 is a wasteful number, since it uses less digits than its factorization.

11111221010100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8127 (or 8120 counting only the distinct ones).

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

Adding to 11111221010100 its reverse (101012211111), we get a palindrome (11212233221211).

The spelling of 11111221010100 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, ten thousand, one hundred".