221103232221 has 16 divisors (see below), whose sum is σ = 302993364800. Its totient is φ = 143418214224.

The previous prime is 221103232193. The next prime is 221103232241. The reversal of 221103232221 is 122232301122.

It is not a de Polignac number, because 221103232221 - 2⁶ = 221103232157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221103232241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 575551 + ... + 879468.

It is an arithmetic number, because the mean of its divisors is an integer number (18937085300).

Almost surely, 2^221103232221 is an apocalyptic number.

It is an amenable number.

221103232221 is a deficient number, since it is larger than the sum of its proper divisors (81890132579).

221103232221 is an frugal number, since it uses more digits than its factorization.

221103232221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1455133 (or 1455059 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 221103232221 its reverse (122232301122), we get a palindrome (343335533343).

The spelling of 221103232221 in words is "two hundred twenty-one billion, one hundred three million, two hundred thirty-two thousand, two hundred twenty-one".