221222202102 has 72 divisors (see below), whose sum is σ = 528179263248. Its totient is φ = 66867910560.

The previous prime is 221222202049. The next prime is 221222202217. The reversal of 221222202102 is 201202222122.

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 (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 736743 + ... + 992589.

Almost surely, 2^221222202102 is an apocalyptic number.

221222202102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 221222202102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264089631624).

221222202102 is an abundant number, since it is smaller than the sum of its proper divisors (306957061146).

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

221222202102 is a wasteful number, since it uses less digits than its factorization.

221222202102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256274 (or 256260 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 221222202102 its reverse (201202222122), we get a palindrome (422424424224).

It can be divided in two parts, 221222 and 202102, that added together give a palindrome (423324).

The spelling of 221222202102 in words is "two hundred twenty-one billion, two hundred twenty-two million, two hundred two thousand, one hundred two".