21560112 has 120 divisors (see below), whose sum is σ = 70141344. Its totient is φ = 6054912.

The previous prime is 21560107. The next prime is 21560113. The reversal of 21560112 is 21106512.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21560113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73438 + ... + 73730.

Almost surely, 2^21560112 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 21560112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35070672).

21560112 is an abundant number, since it is smaller than the sum of its proper divisors (48581232).

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

21560112 is a wasteful number, since it uses less digits than its factorization.

21560112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 21560112 is about 4643.2867669357. The cubic root of 21560112 is about 278.3237950365.

Adding to 21560112 its reverse (21106512), we get a palindrome (42666624).

The spelling of 21560112 in words is "twenty-one million, five hundred sixty thousand, one hundred twelve".