221011112110121 has 4 divisors (see below), whose sum is σ = 221959657655892. Its totient is φ = 220062566564352.

The previous prime is 221011112110093. The next prime is 221011112110123. The reversal of 221011112110121 is 121011211110122.

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 133100892268096 + 87910219842025 = 11536936^2 + 9376045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221011112110121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221011112110121.

It is not an unprimeable number, because it can be changed into a prime (221011112110123) 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, 474272772536 + ... + 474272773001.

It is an arithmetic number, because the mean of its divisors is an integer number (55489914413973).

Almost surely, 2^{221011112110121} is an apocalyptic number.

It is an amenable number.

221011112110121 is a deficient number, since it is larger than the sum of its proper divisors (948545545771).

221011112110121 is an equidigital number, since it uses as much as digits as its factorization.

221011112110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948545545770.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 221011112110121 its reverse (121011211110122), we get a palindrome (342022323220243).

Subtracting from 221011112110121 its reverse (121011211110122), we obtain a palindrome (99999900999999).

The spelling of 221011112110121 in words is "two hundred twenty-one trillion, eleven billion, one hundred twelve million, one hundred ten thousand, one hundred twenty-one".