221000111100 has 72 divisors (see below), whose sum is σ = 710474439920. Its totient is φ = 58933362240.

The previous prime is 221000111083. The next prime is 221000111221. The reversal of 221000111100 is 1111000122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40923247 + ... + 40928646.

Almost surely, 2^221000111100 is an apocalyptic number.

221000111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221000111100 is an abundant number, since it is smaller than the sum of its proper divisors (489474328820).

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

221000111100 is a wasteful number, since it uses less digits than its factorization.

221000111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81851916 (or 81851903 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 221000111100 its reverse (1111000122), we get a palindrome (222111111222).

The spelling of 221000111100 in words is "two hundred twenty-one billion, one hundred eleven thousand, one hundred".