21444984 has 48 divisors (see below), whose sum is σ = 63362520. Its totient is φ = 6498240.

The previous prime is 21444979. The next prime is 21445013. The reversal of 21444984 is 48944412.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a zygodrome in base 3.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 12747 + ... + 14330.

Almost surely, 2^21444984 is an apocalyptic number.

21444984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21444984 is an abundant number, since it is smaller than the sum of its proper divisors (41917536).

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

21444984 is a wasteful number, since it uses less digits than its factorization.

21444984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27100 (or 27093 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 21444984 is about 4630.8729198716. The cubic root of 21444984 is about 277.8275071618.

The spelling of 21444984 in words is "twenty-one million, four hundred forty-four thousand, nine hundred eighty-four".