21116044 has 6 divisors (see below), whose sum is σ = 36953084. Its totient is φ = 10558020.

The previous prime is 21115999. The next prime is 21116059. The reversal of 21116044 is 44061112.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639502 + ... + 2639509.

Almost surely, 2^21116044 is an apocalyptic number.

It is an amenable number.

21116044 is a deficient number, since it is larger than the sum of its proper divisors (15837040).

21116044 is a wasteful number, since it uses less digits than its factorization.

21116044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5279015 (or 5279013 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21116044 is about 4595.2196900692. The cubic root of 21116044 is about 276.3996695153.

Adding to 21116044 its reverse (44061112), we get a palindrome (65177156).

The spelling of 21116044 in words is "twenty-one million, one hundred sixteen thousand, forty-four".