221121221222 has 32 divisors (see below), whose sum is σ = 365668452864. Its totient is φ = 99446092000.

The previous prime is 221121221221. The next prime is 221121221227. The reversal of 221121221222 is 222122121122.

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

It is a junction number, because it is equal to n+sod(n) for n = 221121221194 and 221121221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121221221) 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, 3270653 + ... + 3337575.

It is an arithmetic number, because the mean of its divisors is an integer number (11427139152).

Almost surely, 2^221121221222 is an apocalyptic number.

221121221222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221121221222 is a deficient number, since it is larger than the sum of its proper divisors (144547231642).

221121221222 is a wasteful number, since it uses less digits than its factorization.

221121221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68524.

The product of its digits is 256, while the sum is 20.

Adding to 221121221222 its reverse (222122121122), we get a palindrome (443243342344).

The spelling of 221121221222 in words is "two hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-two".