20001201100100 has 72 divisors (see below), whose sum is σ = 47453751828000. Its totient is φ = 7256965273600.

The previous prime is 20001201100099. The next prime is 20001201100109. The reversal of 20001201100100 is 100110210002.

It is not an unprimeable number, because it can be changed into a prime (20001201100109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19754330 + ... + 20742129.

It is an arithmetic number, because the mean of its divisors is an integer number (659079886500).

Almost surely, 2^{20001201100100} is an apocalyptic number.

20001201100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001201100100 is an abundant number, since it is smaller than the sum of its proper divisors (27452550727900).

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

20001201100100 is a wasteful number, since it uses less digits than its factorization.

20001201100100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40496933 (or 40496926 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 20001201100100 its reverse (100110210002), we get a palindrome (20101311310102).

The spelling of 20001201100100 in words is "twenty trillion, one billion, two hundred one million, one hundred thousand, one hundred".