111000100200021 has 8 divisors (see below), whose sum is σ = 164444592888960. Its totient is φ = 74000066799996.

The previous prime is 111000100199929. The next prime is 111000100200037. The reversal of 111000100200021 is 120002001000111.

It is a happy number.

It is not a de Polignac number, because 111000100200021 - 2¹³ = 111000100191829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 111000100199976 and 111000100200012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111000100200221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2055557411085 + ... + 2055557411138.

It is an arithmetic number, because the mean of its divisors is an integer number (20555574111120).

Almost surely, 2^{111000100200021} is an apocalyptic number.

It is an amenable number.

111000100200021 is a deficient number, since it is larger than the sum of its proper divisors (53444492688939).

111000100200021 is an equidigital number, since it uses as much as digits as its factorization.

111000100200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4111114822232 (or 4111114822226 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 111000100200021 its reverse (120002001000111), we get a palindrome (231002101200132).

The spelling of 111000100200021 in words is "one hundred eleven trillion, one hundred million, two hundred thousand, twenty-one".