20112100200021 has 4 divisors (see below), whose sum is σ = 26816133600032. Its totient is φ = 13408066800012.

The previous prime is 20112100200019. The next prime is 20112100200047. The reversal of 20112100200021 is 12000200121102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20112100200021 - 2¹ = 20112100200019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112100200011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3352016700001 + ... + 3352016700006.

It is an arithmetic number, because the mean of its divisors is an integer number (6704033400008).

Almost surely, 2^{20112100200021} is an apocalyptic number.

It is an amenable number.

20112100200021 is a deficient number, since it is larger than the sum of its proper divisors (6704033400011).

20112100200021 is an equidigital number, since it uses as much as digits as its factorization.

20112100200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6704033400010.

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

Adding to 20112100200021 its reverse (12000200121102), we get a palindrome (32112300321123).

The spelling of 20112100200021 in words is "twenty trillion, one hundred twelve billion, one hundred million, two hundred thousand, twenty-one".