21444528 has 40 divisors (see below), whose sum is σ = 63313408. Its totient is φ = 6126912.

The previous prime is 21444499. The next prime is 21444541. The reversal of 21444528 is 82544412.

It is a super-2 number, since 2×21444528² = 919735562285568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21444495 and 21444504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31576 + ... + 32247.

Almost surely, 2^21444528 is an apocalyptic number.

21444528 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21444528 is an abundant number, since it is smaller than the sum of its proper divisors (41868880).

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

21444528 is a wasteful number, since it uses less digits than its factorization.

21444528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63841 (or 63835 counting only the distinct ones).

The product of its digits is 10240, while the sum is 30.

The square root of 21444528 is about 4630.8236848319. The cubic root of 21444528 is about 277.8255379330.

The spelling of 21444528 in words is "twenty-one million, four hundred forty-four thousand, five hundred twenty-eight".