21200112200 has 24 divisors (see below), whose sum is σ = 49290261330. Its totient is φ = 8480044800.

The previous prime is 21200112137. The next prime is 21200112209. The reversal of 21200112200 is 221100212.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 10749957124 + 10450155076 = 103682^2 + 102226^2 .

It is not an unprimeable number, because it can be changed into a prime (21200112209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53000081 + ... + 53000480.

Almost surely, 2^21200112200 is an apocalyptic number.

21200112200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200112200 is an abundant number, since it is smaller than the sum of its proper divisors (28090149130).

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

21200112200 is a wasteful number, since it uses less digits than its factorization.

21200112200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106000577 (or 106000568 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21200112200 its reverse (221100212), we get a palindrome (21421212412).

The spelling of 21200112200 in words is "twenty-one billion, two hundred million, one hundred twelve thousand, two hundred".