222121021200 has 240 divisors, whose sum is σ = 766845710400. Its totient is φ = 54634199040.

The previous prime is 222121021181. The next prime is 222121021217. The reversal of 222121021200 is 2120121222.

It is a tau number, because it is divible by the number of its divisors (240).

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 222121021200.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23754126 + ... + 23763474.

It is an arithmetic number, because the mean of its divisors is an integer number (3195190460).

Almost surely, 2^222121021200 is an apocalyptic number.

222121021200 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 222121021200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (383422855200).

222121021200 is an abundant number, since it is smaller than the sum of its proper divisors (544724689200).

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

222121021200 is a wasteful number, since it uses less digits than its factorization.

222121021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10906 (or 10895 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 222121021200 its reverse (2120121222), we get a palindrome (224241142422).

The spelling of 222121021200 in words is "two hundred twenty-two billion, one hundred twenty-one million, twenty-one thousand, two hundred".