111101200021 has 18 divisors (see below), whose sum is σ = 131724837762. Its totient is φ = 93432699360.

The previous prime is 111101199997. The next prime is 111101200037. The reversal of 111101200021 is 120002101111.

It can be written as a sum of positive squares in 3 ways, for example, as 44400389796 + 66700810225 = 210714^2 + 258265^2 .

It is not a de Polignac number, because 111101200021 - 2⁷ = 111101199893 is a prime.

It is a super-2 number, since 2×111101200021² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111101199980 and 111101200007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111101200321) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 265950 + ... + 541231.

Almost surely, 2^111101200021 is an apocalyptic number.

It is an amenable number.

111101200021 is a deficient number, since it is larger than the sum of its proper divisors (20623637741).

111101200021 is an frugal number, since it uses more digits than its factorization.

111101200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807301 (or 807241 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 111101200021 its reverse (120002101111), we get a palindrome (231103301132).

The spelling of 111101200021 in words is "one hundred eleven billion, one hundred one million, two hundred thousand, twenty-one".