221100110001100 has 144 divisors (see below), whose sum is σ = 534089131107840. Its totient is φ = 78763343276800.

The previous prime is 221100110001079. The next prime is 221100110001101. The reversal of 221100110001100 is 1100011001122.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (221100110001101) 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, 35542269 + ... + 41297131.

It is an arithmetic number, because the mean of its divisors is an integer number (3708952299360).

Almost surely, 2^{221100110001100} is an apocalyptic number.

221100110001100 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 221100110001100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267044565553920).

221100110001100 is an abundant number, since it is smaller than the sum of its proper divisors (312989021106740).

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

221100110001100 is a wasteful number, since it uses less digits than its factorization.

221100110001100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5755600 (or 5755593 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 221100110001100 its reverse (1100011001122), we get a palindrome (222200121002222).

The spelling of 221100110001100 in words is "two hundred twenty-one trillion, one hundred billion, one hundred ten million, one thousand, one hundred".