21317416 has 16 divisors (see below), whose sum is σ = 40060800. Its totient is φ = 10634544.

The previous prime is 21317377. The next prime is 21317419. The reversal of 21317416 is 61471312.

It is not an unprimeable number, because it can be changed into a prime (21317419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051 + ... + 6613.

It is an arithmetic number, because the mean of its divisors is an integer number (2503800).

Almost surely, 2^21317416 is an apocalyptic number.

It is an amenable number.

21317416 is a deficient number, since it is larger than the sum of its proper divisors (18743384).

21317416 is a wasteful number, since it uses less digits than its factorization.

21317416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6048 (or 6044 counting only the distinct ones).

The product of its digits is 1008, while the sum is 25.

The square root of 21317416 is about 4617.0787301063. The cubic root of 21317416 is about 277.2755146870.

Adding to 21317416 its reverse (61471312), we get a palindrome (82788728).

The spelling of 21317416 in words is "twenty-one million, three hundred seventeen thousand, four hundred sixteen".