21110912 has 32 divisors (see below), whose sum is σ = 42411600. Its totient is φ = 10466560.

The previous prime is 21110909. The next prime is 21110917. The reversal of 21110912 is 21901112.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (21110917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16139 + ... + 17397.

Almost surely, 2^21110912 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 21110912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21205800).

21110912 is an abundant number, since it is smaller than the sum of its proper divisors (21300688).

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

21110912 is a wasteful number, since it uses less digits than its factorization.

21110912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404 (or 1392 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 21110912 is about 4594.6612497550. The cubic root of 21110912 is about 276.3772758315.

It can be divided in two parts, 21110 and 912, that added together give a palindrome (22022).

The spelling of 21110912 in words is "twenty-one million, one hundred ten thousand, nine hundred twelve".