201221021100 has 144 divisors (see below), whose sum is σ = 657027947520. Its totient is φ = 47098732800.

The previous prime is 201221021051. The next prime is 201221021147. The reversal of 201221021100 is 1120122102.

201221021100 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 955612 + ... + 1147011.

It is an arithmetic number, because the mean of its divisors is an integer number (4562694080).

Almost surely, 2^201221021100 is an apocalyptic number.

201221021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201221021100 is an abundant number, since it is smaller than the sum of its proper divisors (455806926420).

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

201221021100 is a wasteful number, since it uses less digits than its factorization.

201221021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102680 (or 2102673 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 201221021100 its reverse (1120122102), we get a palindrome (202341143202).

The spelling of 201221021100 in words is "two hundred one billion, two hundred twenty-one million, twenty-one thousand, one hundred".