221111001100 has 36 divisors (see below), whose sum is σ = 523430045208. Its totient is φ = 80404000000.

The previous prime is 221111001077. The next prime is 221111001169. The reversal of 221111001100 is 1100111122.

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 an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100503901 + ... + 100506100.

It is an arithmetic number, because the mean of its divisors is an integer number (14539723478).

Almost surely, 2^221111001100 is an apocalyptic number.

221111001100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221111001100 is an abundant number, since it is smaller than the sum of its proper divisors (302319044108).

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

221111001100 is a wasteful number, since it uses less digits than its factorization.

221111001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201010026 (or 201010019 counting only the distinct ones).

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

Adding to 221111001100 its reverse (1100111122), we get a palindrome (222211112222).

The spelling of 221111001100 in words is "two hundred twenty-one billion, one hundred eleven million, one thousand, one hundred".