222185581221 has 16 divisors (see below), whose sum is σ = 312254704640. Its totient is φ = 140140854000.

The previous prime is 222185581199. The next prime is 222185581229. The reversal of 222185581221 is 122185581222.

It is not a de Polignac number, because 222185581221 - 2¹¹ = 222185579173 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 222185581221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222185581229) 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, 2552395 + ... + 2638008.

It is an arithmetic number, because the mean of its divisors is an integer number (19515919040).

Almost surely, 2^222185581221 is an apocalyptic number.

It is an amenable number.

222185581221 is a deficient number, since it is larger than the sum of its proper divisors (90069123419).

222185581221 is a wasteful number, since it uses less digits than its factorization.

222185581221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5191176.

The product of its digits is 51200, while the sum is 39.

Subtracting from 222185581221 its reverse (122185581222), we obtain a palindrome (99999999999).

The spelling of 222185581221 in words is "two hundred twenty-two billion, one hundred eighty-five million, five hundred eighty-one thousand, two hundred twenty-one".