21484224 has 56 divisors (see below), whose sum is σ = 63164720. Its totient is φ = 7160832.

The previous prime is 21484213. The next prime is 21484237. The reversal of 21484224 is 42248412.

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4489 + ... + 7944.

Almost surely, 2^21484224 is an apocalyptic number.

21484224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21484224 is an abundant number, since it is smaller than the sum of its proper divisors (41680496).

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

21484224 is a wasteful number, since it uses less digits than its factorization.

21484224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12454 (or 12438 counting only the distinct ones).

The product of its digits is 4096, while the sum is 27.

The square root of 21484224 is about 4635.1077657375. The cubic root of 21484224 is about 277.9968600304.

The spelling of 21484224 in words is "twenty-one million, four hundred eighty-four thousand, two hundred twenty-four".