21444548 has 12 divisors (see below), whose sum is σ = 39735612. Its totient is φ = 10091520.

The previous prime is 21444541. The next prime is 21444581. The reversal of 21444548 is 84544412.

It can be written as a sum of positive squares in 2 ways, for example, as 7441984 + 14002564 = 2728^2 + 3742^2 .

It is not an unprimeable number, because it can be changed into a prime (21444541) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 157613 + ... + 157748.

It is an arithmetic number, because the mean of its divisors is an integer number (3311301).

Almost surely, 2^21444548 is an apocalyptic number.

It is an amenable number.

21444548 is a deficient number, since it is larger than the sum of its proper divisors (18291064).

21444548 is a wasteful number, since it uses less digits than its factorization.

21444548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315382 (or 315380 counting only the distinct ones).

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

The square root of 21444548 is about 4630.8258442744. The cubic root of 21444548 is about 277.8256243033.

The spelling of 21444548 in words is "twenty-one million, four hundred forty-four thousand, five hundred forty-eight".