222121021100 has 144 divisors (see below), whose sum is σ = 549227347200. Its totient is φ = 77182828800.

The previous prime is 222121021081. The next prime is 222121021103. The reversal of 222121021100 is 1120121222.

It is not an unprimeable number, because it can be changed into a prime (222121021103) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 29420126 + ... + 29427674.

It is an arithmetic number, because the mean of its divisors is an integer number (3814078800).

Almost surely, 2^222121021100 is an apocalyptic number.

222121021100 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 222121021100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274613673600).

222121021100 is an abundant number, since it is smaller than the sum of its proper divisors (327106326100).

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

222121021100 is a wasteful number, since it uses less digits than its factorization.

222121021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8760 (or 8753 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 222121021100 its reverse (1120121222), we get a palindrome (223241142322).

The spelling of 222121021100 in words is "two hundred twenty-two billion, one hundred twenty-one million, twenty-one thousand, one hundred".