21484544 has 22 divisors (see below), whose sum is σ = 42950154. Its totient is φ = 10741760.

The previous prime is 21484543. The next prime is 21484571. The reversal of 21484544 is 44548412.

It can be written as a sum of positive squares in only one way, i.e., 18386944 + 3097600 = 4288^2 + 1760^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 21484544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21484543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9467 + ... + 11514.

Almost surely, 2^21484544 is an apocalyptic number.

It is an amenable number.

21484544 is a deficient number, since it is larger than the sum of its proper divisors (21465610).

21484544 is an equidigital number, since it uses as much as digits as its factorization.

21484544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21001 (or 20983 counting only the distinct ones).

The product of its digits is 20480, while the sum is 32.

The square root of 21484544 is about 4635.1422847632. The cubic root of 21484544 is about 277.9982402456.

The spelling of 21484544 in words is "twenty-one million, four hundred eighty-four thousand, five hundred forty-four".