221111101200 has 240 divisors, whose sum is σ = 775213883136. Its totient is φ = 53427110400.

The previous prime is 221111101187. The next prime is 221111101207. The reversal of 221111101200 is 2101111122.

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 not an unprimeable number, because it can be changed into a prime (221111101207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4025119 + ... + 4079681.

Almost surely, 2^221111101200 is an apocalyptic number.

221111101200 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 221111101200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (387606941568).

221111101200 is an abundant number, since it is smaller than the sum of its proper divisors (554102781936).

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

221111101200 is a wasteful number, since it uses less digits than its factorization.

221111101200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54902 (or 54891 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 221111101200 its reverse (2101111122), we get a palindrome (223212212322).

The spelling of 221111101200 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred one thousand, two hundred".