21027416 has 16 divisors (see below), whose sum is σ = 39616440. Its totient is φ = 10463040.

The previous prime is 21027403. The next prime is 21027421. The reversal of 21027416 is 61472012.

It is a junction number, because it is equal to n+sod(n) for n = 21027391 and 21027400.

It is a congruent number.

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, 4541 + ... + 7916.

Almost surely, 2^21027416 is an apocalyptic number.

It is an amenable number.

21027416 is a deficient number, since it is larger than the sum of its proper divisors (18589024).

21027416 is a wasteful number, since it uses less digits than its factorization.

21027416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12674 (or 12670 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21027416 is about 4585.5660501186. The cubic root of 21027416 is about 276.0124268017.

Adding to 21027416 its reverse (61472012), we get a palindrome (82499428).

The spelling of 21027416 in words is "twenty-one million, twenty-seven thousand, four hundred sixteen".