221210121223 has 16 divisors (see below), whose sum is σ = 272827054080. Its totient is φ = 174657964896.

The previous prime is 221210121203. The next prime is 221210121227. The reversal of 221210121223 is 322121012122.

It is a cyclic number.

It is not a de Polignac number, because 221210121223 - 2¹⁷ = 221209990151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221210121223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210121227) 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, 2493865 + ... + 2581042.

It is an arithmetic number, because the mean of its divisors is an integer number (17051690880).

Almost surely, 2^221210121223 is an apocalyptic number.

221210121223 is a deficient number, since it is larger than the sum of its proper divisors (51616932857).

221210121223 is a wasteful number, since it uses less digits than its factorization.

221210121223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5075406.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 221210121223 its reverse (322121012122), we get a palindrome (543331133345).

It can be divided in two parts, 22121012122 and 3, that multiplied together give a palindrome (66363036366).

The spelling of 221210121223 in words is "two hundred twenty-one billion, two hundred ten million, one hundred twenty-one thousand, two hundred twenty-three".