21483224 has 64 divisors (see below), whose sum is σ = 49401600. Its totient is φ = 8553600.

The previous prime is 21483211. The next prime is 21483233. The reversal of 21483224 is 42238412.

It is a Cunningham number, because it is equal to 4635²-1.

It is a junction number, because it is equal to n+sod(n) for n = 21483193 and 21483202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64739 + ... + 65069.

It is an arithmetic number, because the mean of its divisors is an integer number (771900).

Almost surely, 2^21483224 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 21483224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24700800).

21483224 is an abundant number, since it is smaller than the sum of its proper divisors (27918376).

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

21483224 is a wasteful number, since it uses less digits than its factorization.

21483224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 420 counting only the distinct ones).

The product of its digits is 3072, while the sum is 26.

The square root of 21483224 is about 4634.9998921251. Note that the first 3 decimals coincide. The cubic root of 21483224 is about 277.9925467698.

It can be divided in two parts, 214 and 83224, that added together give a palindrome (83438).

The spelling of 21483224 in words is "twenty-one million, four hundred eighty-three thousand, two hundred twenty-four".