111100211200021 has 32 divisors (see below), whose sum is σ = 117558607340160. Its totient is φ = 104880585216000.

The previous prime is 111100211200001. The next prime is 111100211200079. The reversal of 111100211200021 is 120002112001111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111100211200021 - 2¹⁹ = 111100210675733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111100211199974 and 111100211200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111100211200001) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 206698821 + ... + 207235621.

It is an arithmetic number, because the mean of its divisors is an integer number (3673706479380).

Almost surely, 2^{111100211200021} is an apocalyptic number.

It is an amenable number.

111100211200021 is a deficient number, since it is larger than the sum of its proper divisors (6458396140139).

111100211200021 is a wasteful number, since it uses less digits than its factorization.

111100211200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538245.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111100211200021 its reverse (120002112001111), we get a palindrome (231102323201132).

The spelling of 111100211200021 in words is "one hundred eleven trillion, one hundred billion, two hundred eleven million, two hundred thousand, twenty-one".