21310112 has 48 divisors (see below), whose sum is σ = 45505152. Its totient is φ = 9784320.

The previous prime is 21310097. The next prime is 21310117. The reversal of 21310112 is 21101312.

It is a junction number, because it is equal to n+sod(n) for n = 21310093 and 21310102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22937 + ... + 23847.

It is an arithmetic number, because the mean of its divisors is an integer number (948024).

Almost surely, 2^21310112 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 21310112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22752576).

21310112 is an abundant number, since it is smaller than the sum of its proper divisors (24195040).

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

21310112 is a wasteful number, since it uses less digits than its factorization.

21310112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981 (or 973 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 21310112 is about 4616.2876860092. The cubic root of 21310112 is about 277.2438433733.

Adding to 21310112 its reverse (21101312), we get a palindrome (42411424).

The spelling of 21310112 in words is "twenty-one million, three hundred ten thousand, one hundred twelve".