21200222112 has 96 divisors (see below), whose sum is σ = 57255516864. Its totient is φ = 6863616000.

The previous prime is 21200222111. The next prime is 21200222137. The reversal of 21200222112 is 21122200212.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 21200222091 and 21200222100.

It is not an unprimeable number, because it can be changed into a prime (21200222111) 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, 2129787 + ... + 2139717.

It is an arithmetic number, because the mean of its divisors is an integer number (596411634).

Almost surely, 2^21200222112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21200222112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28627758432).

21200222112 is an abundant number, since it is smaller than the sum of its proper divisors (36055294752).

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

21200222112 is a wasteful number, since it uses less digits than its factorization.

21200222112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10582 (or 10574 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21200222112 its reverse (21122200212), we get a palindrome (42322422324).

The spelling of 21200222112 in words is "twenty-one billion, two hundred million, two hundred twenty-two thousand, one hundred twelve".