21120200112 has 80 divisors (see below), whose sum is σ = 60972347520. Its totient is φ = 6243955200.

The previous prime is 21120200111. The next prime is 21120200113. The reversal of 21120200112 is 21100202112.

It is an interprime number because it is at equal distance from previous prime (21120200111) and next prime (21120200113).

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 (21120200111) 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, 466162 + ... + 509457.

It is an arithmetic number, because the mean of its divisors is an integer number (762154344).

Almost surely, 2^21120200112 is an apocalyptic number.

21120200112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21120200112 is an abundant number, since it is smaller than the sum of its proper divisors (39852147408).

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

21120200112 is a wasteful number, since it uses less digits than its factorization.

21120200112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975682 (or 975676 counting only the distinct ones).

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

Adding to 21120200112 its reverse (21100202112), we get a palindrome (42220402224).

The spelling of 21120200112 in words is "twenty-one billion, one hundred twenty million, two hundred thousand, one hundred twelve".