20211200021100 has 72 divisors (see below), whose sum is σ = 63793896804288. Its totient is φ = 4899684852800.

The previous prime is 20211200021057. The next prime is 20211200021119. The reversal of 20211200021100 is 112000211202.

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 23 ways as a sum of consecutive naturals, for example, 3062299734 + ... + 3062306333.

It is an arithmetic number, because the mean of its divisors is an integer number (886026344504).

Almost surely, 2^{20211200021100} is an apocalyptic number.

20211200021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20211200021100 is an abundant number, since it is smaller than the sum of its proper divisors (43582696783188).

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

20211200021100 is a wasteful number, since it uses less digits than its factorization.

20211200021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6124606095 (or 6124606088 counting only the distinct ones).

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

Adding to 20211200021100 its reverse (112000211202), we get a palindrome (20323200232302).

The spelling of 20211200021100 in words is "twenty trillion, two hundred eleven billion, two hundred million, twenty-one thousand, one hundred".