21114224 has 20 divisors (see below), whose sum is σ = 42229440. Its totient is φ = 10216320.

The previous prime is 21114217. The next prime is 21114229. The reversal of 21114224 is 42241112.

21114224 is an admirable number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21114229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20789 + ... + 21780.

It is an arithmetic number, because the mean of its divisors is an integer number (2111472).

Almost surely, 2^21114224 is an apocalyptic number.

It is an amenable number.

21114224 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21114224 is a wasteful number, since it uses less digits than its factorization.

21114224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42608 (or 42602 counting only the distinct ones).

The product of its digits is 128, while the sum is 17.

The square root of 21114224 is about 4595.0216539207. The cubic root of 21114224 is about 276.3917282890.

Adding to 21114224 its reverse (42241112), we get a palindrome (63355336).

The spelling of 21114224 in words is "twenty-one million, one hundred fourteen thousand, two hundred twenty-four".