221221102222 has 4 divisors (see below), whose sum is σ = 331831653336. Its totient is φ = 110610551110.

The previous prime is 221221102183. The next prime is 221221102237. The reversal of 221221102222 is 222201122122.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 221221102222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55305275554 + ... + 55305275557.

It is an arithmetic number, because the mean of its divisors is an integer number (82957913334).

Almost surely, 2^221221102222 is an apocalyptic number.

221221102222 is a deficient number, since it is larger than the sum of its proper divisors (110610551114).

221221102222 is a wasteful number, since it uses less digits than its factorization.

221221102222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110610551113.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221221102222 its reverse (222201122122), we get a palindrome (443422224344).

The spelling of 221221102222 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred two thousand, two hundred twenty-two".