221001110121 has 16 divisors (see below), whose sum is σ = 321735015360. Its totient is φ = 133823877120.

The previous prime is 221001110119. The next prime is 221001110129. The reversal of 221001110121 is 121011100122.

221001110121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221001110121 - 2¹ = 221001110119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221001110097 and 221001110106.

It is not an unprimeable number, because it can be changed into a prime (221001110129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2866116 + ... + 2942213.

It is an arithmetic number, because the mean of its divisors is an integer number (20108438460).

Almost surely, 2^221001110121 is an apocalyptic number.

It is an amenable number.

221001110121 is a deficient number, since it is larger than the sum of its proper divisors (100733905239).

221001110121 is a wasteful number, since it uses less digits than its factorization.

221001110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5809496.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 221001110121 its reverse (121011100122), we get a palindrome (342012210243).

Subtracting from 221001110121 its reverse (121011100122), we obtain a palindrome (99990009999).

The spelling of 221001110121 in words is "two hundred twenty-one billion, one million, one hundred ten thousand, one hundred twenty-one".