221212221102 has 16 divisors (see below), whose sum is σ = 491582713680. Its totient is φ = 73737407016.

The previous prime is 221212221037. The next prime is 221212221199. The reversal of 221212221102 is 201122212122.

It is a happy number.

221212221102 is a `hidden beast` number, since 221 + 212 + 221 + 10 + 2 = 666.

221212221102 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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, 2048261253 + ... + 2048261360.

It is an arithmetic number, because the mean of its divisors is an integer number (30723919605).

Almost surely, 2^221212221102 is an apocalyptic number.

221212221102 is an abundant number, since it is smaller than the sum of its proper divisors (270370492578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221212221102 is a wasteful number, since it uses less digits than its factorization.

221212221102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4096522624 (or 4096522618 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221212221102 its reverse (201122212122), we get a palindrome (422334433224).

The spelling of 221212221102 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, one hundred two".