221100110121 has 16 divisors (see below), whose sum is σ = 321664605120. Its totient is φ = 133973214720.

The previous prime is 221100110111. The next prime is 221100110177. The reversal of 221100110121 is 121011001122.

It is not a de Polignac number, because 221100110121 - 2²¹ = 221098012969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221100110097 and 221100110106.

It is not an unprimeable number, because it can be changed into a prime (221100110111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 503500 + ... + 834093.

It is an arithmetic number, because the mean of its divisors is an integer number (20104037820).

Almost surely, 2^221100110121 is an apocalyptic number.

It is an amenable number.

221100110121 is a deficient number, since it is larger than the sum of its proper divisors (100564494999).

221100110121 is a wasteful number, since it uses less digits than its factorization.

221100110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342616.

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

Adding to 221100110121 its reverse (121011001122), we get a palindrome (342111111243).

It can be divided in two parts, 2211001101 and 21, that added together give a palindrome (2211001122).

The spelling of 221100110121 in words is "two hundred twenty-one billion, one hundred million, one hundred ten thousand, one hundred twenty-one".