221111221222222 has 16 divisors (see below), whose sum is σ = 331954839908352. Its totient is φ = 110459609540280.

The previous prime is 221111221222219. The next prime is 221111221222277. The reversal of 221111221222222 is 222222122111122.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331333333 + ... + 331999999.

It is an arithmetic number, because the mean of its divisors is an integer number (20747177494272).

Almost surely, 2^{221111221222222} is an apocalyptic number.

221111221222222 is a deficient number, since it is larger than the sum of its proper divisors (110843618686130).

221111221222222 is a wasteful number, since it uses less digits than its factorization.

221111221222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810423.

The product of its digits is 1024, while the sum is 25.

Adding to 221111221222222 its reverse (222222122111122), we get a palindrome (443333343333344).

The spelling of 221111221222222 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-two".