222111201221 has 16 divisors (see below), whose sum is σ = 273457632000. Its totient is φ = 175678478208.

The previous prime is 222111201217. The next prime is 222111201223. The reversal of 222111201221 is 122102111222.

It is a cyclic number.

It is not a de Polignac number, because 222111201221 - 2² = 222111201217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 222111201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222111201223) 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, 122801 + ... + 677718.

It is an arithmetic number, because the mean of its divisors is an integer number (17091102000).

Almost surely, 2^222111201221 is an apocalyptic number.

It is an amenable number.

222111201221 is a deficient number, since it is larger than the sum of its proper divisors (51346430779).

222111201221 is a wasteful number, since it uses less digits than its factorization.

222111201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803588.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 222111201221 its reverse (122102111222), we get a palindrome (344213312443).

The spelling of 222111201221 in words is "two hundred twenty-two billion, one hundred eleven million, two hundred one thousand, two hundred twenty-one".