221221301222 has 16 divisors (see below), whose sum is σ = 340568783280. Its totient is φ = 107735472768.

The previous prime is 221221301113. The next prime is 221221301227. The reversal of 221221301222 is 222103122122.

221221301222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221221301222² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221221301194 and 221221301203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221301227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9262823 + ... + 9286674.

It is an arithmetic number, because the mean of its divisors is an integer number (21285548955).

Almost surely, 2^221221301222 is an apocalyptic number.

221221301222 is a deficient number, since it is larger than the sum of its proper divisors (119347482058).

221221301222 is a wasteful number, since it uses less digits than its factorization.

221221301222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18549655.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 221221301222 its reverse (222103122122), we get a palindrome (443324423344).

The spelling of 221221301222 in words is "two hundred twenty-one billion, two hundred twenty-one million, three hundred one thousand, two hundred twenty-two".