201221011100 has 36 divisors (see below), whose sum is σ = 443807797608. Its totient is φ = 79168920000.

The previous prime is 201221011097. The next prime is 201221011109. The reversal of 201221011100 is 1110122102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221011109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16487426 + ... + 16499625.

It is an arithmetic number, because the mean of its divisors is an integer number (12327994378).

Almost surely, 2^201221011100 is an apocalyptic number.

201221011100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201221011100 is an abundant number, since it is smaller than the sum of its proper divisors (242586786508).

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

201221011100 is a wasteful number, since it uses less digits than its factorization.

201221011100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32987126 (or 32987119 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 201221011100 its reverse (1110122102), we get a palindrome (202331133202).

The spelling of 201221011100 in words is "two hundred one billion, two hundred twenty-one million, eleven thousand, one hundred".