21126416 has 20 divisors (see below), whose sum is σ = 41885712. Its totient is φ = 10317216.

The previous prime is 21126409. The next prime is 21126421. The reversal of 21126416 is 61462112.

It is a junction number, because it is equal to n+sod(n) for n = 21126391 and 21126400.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14666 + ... + 16041.

Almost surely, 2^21126416 is an apocalyptic number.

It is an amenable number.

21126416 is a deficient number, since it is larger than the sum of its proper divisors (20759296).

21126416 is a wasteful number, since it uses less digits than its factorization.

21126416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30758 (or 30752 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

The square root of 21126416 is about 4596.3481156240. The cubic root of 21126416 is about 276.4449170707. Note that the first 3 decimals are identical.

Adding to 21126416 its reverse (61462112), we get a palindrome (82588528).

The spelling of 21126416 in words is "twenty-one million, one hundred twenty-six thousand, four hundred sixteen".