221103201221 has 32 divisors (see below), whose sum is σ = 261719040000. Its totient is φ = 186681798576.

The previous prime is 221103201181. The next prime is 221103201233. The reversal of 221103201221 is 122102301122.

It is not a de Polignac number, because 221103201221 - 2²² = 221099006917 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 221103201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221103201721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11886290 + ... + 11904876.

It is an arithmetic number, because the mean of its divisors is an integer number (8178720000).

Almost surely, 2^221103201221 is an apocalyptic number.

It is an amenable number.

221103201221 is a deficient number, since it is larger than the sum of its proper divisors (40615838779).

221103201221 is an equidigital number, since it uses as much as digits as its factorization.

221103201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19126 (or 19112 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 221103201221 its reverse (122102301122), we get a palindrome (343205502343).

Subtracting from 221103201221 its reverse (122102301122), we obtain a palindrome (99000900099).

The spelling of 221103201221 in words is "two hundred twenty-one billion, one hundred three million, two hundred one thousand, two hundred twenty-one".