22221222100 has 144 divisors (see below), whose sum is σ = 60715863936. Its totient is φ = 6857280000.

The previous prime is 22221222083. The next prime is 22221222103. The reversal of 22221222100 is 122212222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221222103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 763414 + ... + 791986.

It is an arithmetic number, because the mean of its divisors is an integer number (421637944).

Almost surely, 2^22221222100 is an apocalyptic number.

22221222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22221222100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30357931968).

22221222100 is an abundant number, since it is smaller than the sum of its proper divisors (38494641836).

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

22221222100 is a wasteful number, since it uses less digits than its factorization.

22221222100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28706 (or 28699 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 22221222100 its reverse (122212222), we get a palindrome (22343434322).

It can be divided in two parts, 2222122 and 2100, that added together give a palindrome (2224222).

The spelling of 22221222100 in words is "twenty-two billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred".