201111221100 has 36 divisors (see below), whose sum is σ = 581881800584. Its totient is φ = 53629658880.

The previous prime is 201111221089. The next prime is 201111221107. The reversal of 201111221100 is 1122111102.

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 (201111221107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 335185069 + ... + 335185668.

Almost surely, 2^201111221100 is an apocalyptic number.

201111221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201111221100 is an abundant number, since it is smaller than the sum of its proper divisors (380770579484).

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

201111221100 is a wasteful number, since it uses less digits than its factorization.

201111221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670370754 (or 670370747 counting only the distinct ones).

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

Adding to 201111221100 its reverse (1122111102), we get a palindrome (202233332202).

The spelling of 201111221100 in words is "two hundred one billion, one hundred eleven million, two hundred twenty-one thousand, one hundred".