221100001123 has 24 divisors (see below), whose sum is σ = 236548166400. Its totient is φ = 206611794048.

The previous prime is 221100001117. The next prime is 221100001151. The reversal of 221100001123 is 321100001122.

It is not a de Polignac number, because 221100001123 - 2⁵ = 221100001091 is a prime.

It is a super-2 number, since 2×221100001123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221100001103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37605498 + ... + 37611376.

It is an arithmetic number, because the mean of its divisors is an integer number (9856173600).

Almost surely, 2^221100001123 is an apocalyptic number.

221100001123 is a deficient number, since it is larger than the sum of its proper divisors (15448165277).

221100001123 is a wasteful number, since it uses less digits than its factorization.

221100001123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6819 (or 6802 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 221100001123 its reverse (321100001122), we get a palindrome (542200002245).

Subtracting 221100001123 from its reverse (321100001122), we obtain a palindrome (99999999999).

The spelling of 221100001123 in words is "two hundred twenty-one billion, one hundred million, one thousand, one hundred twenty-three".