221001331100 has 144 divisors (see below), whose sum is σ = 555604751520. Its totient is φ = 75410227200.

The previous prime is 221001331051. The next prime is 221001331123. The reversal of 221001331100 is 1133100122.

It is a congruent number.

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, 6284366 + ... + 6319434.

It is an arithmetic number, because the mean of its divisors is an integer number (3858366330).

Almost surely, 2^221001331100 is an apocalyptic number.

221001331100 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 221001331100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277802375760).

221001331100 is an abundant number, since it is smaller than the sum of its proper divisors (334603420420).

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

221001331100 is a wasteful number, since it uses less digits than its factorization.

221001331100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35448 (or 35441 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 221001331100 its reverse (1133100122), we get a palindrome (222134431222).

The spelling of 221001331100 in words is "two hundred twenty-one billion, one million, three hundred thirty-one thousand, one hundred".