21200113212 has 24 divisors (see below), whose sum is σ = 50673442512. Its totient is φ = 6894345600.

The previous prime is 21200113199. The next prime is 21200113217. The reversal of 21200113212 is 21231100212.

It is a junction number, because it is equal to n+sod(n) for n = 21200113191 and 21200113200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200113217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21544339 + ... + 21545322.

It is an arithmetic number, because the mean of its divisors is an integer number (2111393438).

Almost surely, 2^21200113212 is an apocalyptic number.

It is an amenable number.

21200113212 is an abundant number, since it is smaller than the sum of its proper divisors (29473329300).

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

21200113212 is a wasteful number, since it uses less digits than its factorization.

21200113212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43089709 (or 43089707 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21200113212 its reverse (21231100212), we get a palindrome (42431213424).

The spelling of 21200113212 in words is "twenty-one billion, two hundred million, one hundred thirteen thousand, two hundred twelve".