221221100223 has 12 divisors (see below), whose sum is σ = 322705368648. Its totient is φ = 146020527600.

The previous prime is 221221100209. The next prime is 221221100281. The reversal of 221221100223 is 322001122122.

221221100223 is a `hidden beast` number, since 221 + 221 + 1 + 0 + 0 + 223 = 666.

It is not a de Polignac number, because 221221100223 - 2¹⁶ = 221221034687 is a prime.

It is a super-2 number, since 2×221221100223² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221221100196 and 221221100205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221100923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121682865 + ... + 121684682.

It is an arithmetic number, because the mean of its divisors is an integer number (26892114054).

Almost surely, 2^221221100223 is an apocalyptic number.

221221100223 is a deficient number, since it is larger than the sum of its proper divisors (101484268425).

221221100223 is a wasteful number, since it uses less digits than its factorization.

221221100223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243367654 (or 243367651 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 221221100223 its reverse (322001122122), we get a palindrome (543222222345).

The spelling of 221221100223 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, two hundred twenty-three".