21044982 has 32 divisors (see below), whose sum is σ = 48690432. Its totient is φ = 5939424.

The previous prime is 21044927. The next prime is 21044987. The reversal of 21044982 is 28944012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044987) 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 15 ways as a sum of consecutive naturals, for example, 468 + ... + 6504.

It is an arithmetic number, because the mean of its divisors is an integer number (1521576).

Almost surely, 2^21044982 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21044982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24345216).

21044982 is an abundant number, since it is smaller than the sum of its proper divisors (27645450).

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

21044982 is a wasteful number, since it uses less digits than its factorization.

21044982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6132.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 21044982 is about 4587.4810081351. The cubic root of 21044982 is about 276.0892643426.

Adding to 21044982 its reverse (28944012), we get a palindrome (49988994).

The spelling of 21044982 in words is "twenty-one million, forty-four thousand, nine hundred eighty-two".