21034444 has 24 divisors (see below), whose sum is σ = 39412800. Its totient is φ = 9792720.

The previous prime is 21034421. The next prime is 21034471. The reversal of 21034444 is 44443012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2139 + ... + 6829.

It is an arithmetic number, because the mean of its divisors is an integer number (1642200).

Almost surely, 2^21034444 is an apocalyptic number.

It is an amenable number.

21034444 is a deficient number, since it is larger than the sum of its proper divisors (18378356).

21034444 is a wasteful number, since it uses less digits than its factorization.

21034444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4773 (or 4771 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 21034444 is about 4586.3323037041. The cubic root of 21034444 is about 276.0431739504.

Adding to 21034444 its reverse (44443012), we get a palindrome (65477456).

The spelling of 21034444 in words is "twenty-one million, thirty-four thousand, four hundred forty-four".