21100200020112 has 80 divisors (see below), whose sum is σ = 56288104616448. Its totient is φ = 6803987358720.

The previous prime is 21100200020101. The next prime is 21100200020113. The reversal of 21100200020112 is 21102000200112.

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

It is not an unprimeable number, because it can be changed into a prime (21100200020113) 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 15 ways as a sum of consecutive naturals, for example, 1374388 + ... + 6639980.

Almost surely, 2^{21100200020112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21100200020112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28144052308224).

21100200020112 is an abundant number, since it is smaller than the sum of its proper divisors (35187904596336).

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

21100200020112 is a wasteful number, since it uses less digits than its factorization.

21100200020112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5268328 (or 5268322 counting only the distinct ones).

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

Adding to 21100200020112 its reverse (21102000200112), we get a palindrome (42202200220224).

The spelling of 21100200020112 in words is "twenty-one trillion, one hundred billion, two hundred million, twenty thousand, one hundred twelve".