22221121110 has 64 divisors (see below), whose sum is σ = 56200504320. Its totient is φ = 5607463680.

The previous prime is 22221121099. The next prime is 22221121121. The reversal of 22221121110 is 1112112222.

It is an interprime number because it is at equal distance from previous prime (22221121099) and next prime (22221121121).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 22221121110.

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 31 ways as a sum of consecutive naturals, for example, 497874 + ... + 540666.

It is an arithmetic number, because the mean of its divisors is an integer number (878132880).

Almost surely, 2^22221121110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22221121110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28100252160).

22221121110 is an abundant number, since it is smaller than the sum of its proper divisors (33979383210).

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

22221121110 is a wasteful number, since it uses less digits than its factorization.

22221121110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43733.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 22221121110 its reverse (1112112222), we get a palindrome (23333233332).

It can be divided in two parts, 2222112 and 1110, that added together give a palindrome (2223222).

The spelling of 22221121110 in words is "twenty-two billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred ten".