21044444 has 6 divisors (see below), whose sum is σ = 36827784. Its totient is φ = 10522220.

The previous prime is 21044431. The next prime is 21044467. The reversal of 21044444 is 44444012.

21044444 is a modest number, since divided by 4444 gives 2104 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2630552 + ... + 2630559.

It is an arithmetic number, because the mean of its divisors is an integer number (6137964).

Almost surely, 2^21044444 is an apocalyptic number.

It is an amenable number.

21044444 is a deficient number, since it is larger than the sum of its proper divisors (15783340).

21044444 is a wasteful number, since it uses less digits than its factorization.

21044444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5261115 (or 5261113 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 23.

The square root of 21044444 is about 4587.4223699154. The cubic root of 21044444 is about 276.0869116473.

Adding to 21044444 its reverse (44444012), we get a palindrome (65488456).

The spelling of 21044444 in words is "twenty-one million, forty-four thousand, four hundred forty-four".