20001200021100 has 108 divisors (see below), whose sum is σ = 63267812527920. Its totient is φ = 5284720713600.

The previous prime is 20001200021063. The next prime is 20001200021113. The reversal of 20001200021100 is 112000210002.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 101844816 + ... + 102041015.

Almost surely, 2^{20001200021100} is an apocalyptic number.

20001200021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001200021100 is an abundant number, since it is smaller than the sum of its proper divisors (43266612506820).

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

20001200021100 is a wasteful number, since it uses less digits than its factorization.

20001200021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203885960 (or 203885950 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20001200021100 its reverse (112000210002), we get a palindrome (20113200231102).

The spelling of 20001200021100 in words is "twenty trillion, one billion, two hundred million, twenty-one thousand, one hundred".