21222201111200 has 144 divisors (see below), whose sum is σ = 52285539198816. Its totient is φ = 8410951910400.

The previous prime is 21222201111187. The next prime is 21222201111203. The reversal of 21222201111200 is 211110222212.

It is not an unprimeable number, because it can be changed into a prime (21222201111203) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 67228934 + ... + 67543866.

It is an arithmetic number, because the mean of its divisors is an integer number (363094022214).

Almost surely, 2^{21222201111200} is an apocalyptic number.

21222201111200 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 21222201111200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26142769599408).

21222201111200 is an abundant number, since it is smaller than the sum of its proper divisors (31063338087616).

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

21222201111200 is a wasteful number, since it uses less digits than its factorization.

21222201111200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315727 (or 315714 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21222201111200 its reverse (211110222212), we get a palindrome (21433311333412).

The spelling of 21222201111200 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred one million, one hundred eleven thousand, two hundred".