111100211111021 has 32 divisors (see below), whose sum is σ = 133069204252800. Its totient is φ = 92384929929600.

The previous prime is 111100211111009. The next prime is 111100211111041. The reversal of 111100211111021 is 120111112001111.

It is not a de Polignac number, because 111100211111021 - 2¹⁴ = 111100211094637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111100211110987 and 111100211111005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111100211111041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75011840 + ... + 76478601.

It is an arithmetic number, because the mean of its divisors is an integer number (4158412632900).

Almost surely, 2^{111100211111021} is an apocalyptic number.

111100211111021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111100211111021 is a deficient number, since it is larger than the sum of its proper divisors (21968993141779).

111100211111021 is a wasteful number, since it uses less digits than its factorization.

111100211111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151490522 (or 151490500 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 111100211111021 its reverse (120111112001111), we get a palindrome (231211323112132).

The spelling of 111100211111021 in words is "one hundred eleven trillion, one hundred billion, two hundred eleven million, one hundred eleven thousand, twenty-one".