201221101200 has 240 divisors, whose sum is σ = 737274525696. Its totient is φ = 45955084800.

The previous prime is 201221101181. The next prime is 201221101243. The reversal of 201221101200 is 2101122102.

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 (12).

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, 10767865 + ... + 10786535.

Almost surely, 2^201221101200 is an apocalyptic number.

201221101200 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 201221101200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (368637262848).

201221101200 is an abundant number, since it is smaller than the sum of its proper divisors (536053424496).

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

201221101200 is a wasteful number, since it uses less digits than its factorization.

201221101200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19982 (or 19971 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 201221101200 its reverse (2101122102), we get a palindrome (203322223302).

The spelling of 201221101200 in words is "two hundred one billion, two hundred twenty-one million, one hundred one thousand, two hundred".