21200000112 has 60 divisors (see below), whose sum is σ = 60934099720. Its totient is φ = 6875673984.

The previous prime is 21200000083. The next prime is 21200000113. The reversal of 21200000112 is 21100000212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21200000094 and 21200000103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200000113) 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 11 ways as a sum of consecutive naturals, for example, 1984162 + ... + 1994817.

Almost surely, 2^21200000112 is an apocalyptic number.

It is an amenable number.

21200000112 is an abundant number, since it is smaller than the sum of its proper divisors (39734099608).

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

21200000112 is a wasteful number, since it uses less digits than its factorization.

21200000112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3979030 (or 3979021 counting only the distinct ones).

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

Adding to 21200000112 its reverse (21100000212), we get a palindrome (42300000324).

The spelling of 21200000112 in words is "twenty-one billion, two hundred million, one hundred twelve", and thus it is an aban number.