21201100002112 has 56 divisors (see below), whose sum is σ = 44599821448896. Its totient is φ = 9964865107968.

The previous prime is 21201100002079. The next prime is 21201100002133. The reversal of 21201100002112 is 21120000110212.

It is a junction number, because it is equal to n+sod(n) for n = 21201100002092 and 21201100002101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10943158 + ... + 12734005.

It is an arithmetic number, because the mean of its divisors is an integer number (796425383016).

Almost surely, 2^{21201100002112} is an apocalyptic number.

It is an amenable number.

21201100002112 is an abundant number, since it is smaller than the sum of its proper divisors (23398721446784).

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

21201100002112 is a wasteful number, since it uses less digits than its factorization.

21201100002112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23678015 (or 23678005 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21201100002112 its reverse (21120000110212), we get a palindrome (42321100112324).

The spelling of 21201100002112 in words is "twenty-one trillion, two hundred one billion, one hundred million, two thousand, one hundred twelve".