21100022112 has 96 divisors (see below), whose sum is σ = 59791979520. Its totient is φ = 6476659200.

The previous prime is 21100022081. The next prime is 21100022117. The reversal of 21100022112 is 21122000112.

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

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100022117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 502737 + ... + 543087.

It is an arithmetic number, because the mean of its divisors is an integer number (622833120).

Almost surely, 2^21100022112 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 21100022112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29895989760).

21100022112 is an abundant number, since it is smaller than the sum of its proper divisors (38691957408).

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

21100022112 is a wasteful number, since it uses less digits than its factorization.

21100022112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40796 (or 40788 counting only the distinct ones).

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

Adding to 21100022112 its reverse (21122000112), we get a palindrome (42222022224).

The spelling of 21100022112 in words is "twenty-one billion, one hundred million, twenty-two thousand, one hundred twelve".