21416816 has 10 divisors (see below), whose sum is σ = 41495112. Its totient is φ = 10708400.

The previous prime is 21416807. The next prime is 21416827. The reversal of 21416816 is 61861412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669260 + ... + 669291.

Almost surely, 2^21416816 is an apocalyptic number.

It is an amenable number.

21416816 is a deficient number, since it is larger than the sum of its proper divisors (20078296).

21416816 is a wasteful number, since it uses less digits than its factorization.

21416816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338559 (or 1338553 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 21416816 is about 4627.8305932694. The cubic root of 21416816 is about 277.7058116620.

The spelling of 21416816 in words is "twenty-one million, four hundred sixteen thousand, eight hundred sixteen".