221121121222 has 16 divisors (see below), whose sum is σ = 332342826480. Its totient is φ = 110340348768.

The previous prime is 221121121217. The next prime is 221121121223. The reversal of 221121121222 is 222121121122.

221121121222 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 221121121222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121121223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2649304 + ... + 2731492.

It is an arithmetic number, because the mean of its divisors is an integer number (20771426655).

Almost surely, 2^221121121222 is an apocalyptic number.

221121121222 is a deficient number, since it is larger than the sum of its proper divisors (111221705258).

221121121222 is a wasteful number, since it uses less digits than its factorization.

221121121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84855.

The product of its digits is 128, while the sum is 19.

Adding to 221121121222 its reverse (222121121122), we get a palindrome (443242242344).

The spelling of 221121121222 in words is "two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-two".