221021122222222 has 32 divisors (see below), whose sum is σ = 379540062922752. Its totient is φ = 94561678973664.

The previous prime is 221021122222217. The next prime is 221021122222283. The reversal of 221021122222222 is 222222221120122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144153813 + ... + 145678975.

It is an arithmetic number, because the mean of its divisors is an integer number (11860626966336).

Almost surely, 2^{221021122222222} is an apocalyptic number.

221021122222222 is a deficient number, since it is larger than the sum of its proper divisors (158518940700530).

221021122222222 is a wasteful number, since it uses less digits than its factorization.

221021122222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542832.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 221021122222222 its reverse (222222221120122), we get a palindrome (443243343342344).

The spelling of 221021122222222 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-two".