12001222221100 has 288 divisors, whose sum is σ = 32328270858240. Its totient is φ = 3772843008000.

The previous prime is 12001222221071. The next prime is 12001222221103. The reversal of 12001222221100 is 112222210021.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (12001222221103) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 350782995 + ... + 350817205.

It is an arithmetic number, because the mean of its divisors is an integer number (112250940480).

Almost surely, 2^{12001222221100} is an apocalyptic number.

12001222221100 is a gapful number since it is divisible by the number (10) 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 12001222221100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16164135429120).

12001222221100 is an abundant number, since it is smaller than the sum of its proper divisors (20327048637140).

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

12001222221100 is a wasteful number, since it uses less digits than its factorization.

12001222221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35009 (or 35002 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12001222221100 its reverse (112222210021), we get a palindrome (12113444431121).

The spelling of 12001222221100 in words is "twelve trillion, one billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred".