111211102100221 has 4 divisors (see below), whose sum is σ = 112231387440700. Its totient is φ = 110190816759744.

The previous prime is 111211102100213. The next prime is 111211102100233. The reversal of 111211102100221 is 122001201112111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78043708035225 + 33167394064996 = 8834235^2 + 5759114^2 .

It is a cyclic number.

It is not a de Polignac number, because 111211102100221 - 2³ = 111211102100213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111211102100195 and 111211102100204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211102100281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510142670076 + ... + 510142670293.

It is an arithmetic number, because the mean of its divisors is an integer number (28057846860175).

Almost surely, 2^{111211102100221} is an apocalyptic number.

It is an amenable number.

111211102100221 is a deficient number, since it is larger than the sum of its proper divisors (1020285340479).

111211102100221 is a wasteful number, since it uses less digits than its factorization.

111211102100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020285340478.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 111211102100221 its reverse (122001201112111), we get a palindrome (233212303212332).

The spelling of 111211102100221 in words is "one hundred eleven trillion, two hundred eleven billion, one hundred two million, one hundred thousand, two hundred twenty-one".