21200120112 has 40 divisors (see below), whose sum is σ = 54781444656. Its totient is φ = 7064839936.

The previous prime is 21200120087. The next prime is 21200120159. The reversal of 21200120112 is 21102100212.

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 7 ways as a sum of consecutive naturals, for example, 131638 + ... + 244394.

Almost surely, 2^21200120112 is an apocalyptic number.

It is an amenable number.

21200120112 is an abundant number, since it is smaller than the sum of its proper divisors (33581324544).

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

21200120112 is a wasteful number, since it uses less digits than its factorization.

21200120112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116685 (or 116679 counting only the distinct ones).

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

Adding to 21200120112 its reverse (21102100212), we get a palindrome (42302220324).

The spelling of 21200120112 in words is "twenty-one billion, two hundred million, one hundred twenty thousand, one hundred twelve".