21307016 has 32 divisors (see below), whose sum is σ = 42672960. Its totient is φ = 9949632.

The previous prime is 21306997. The next prime is 21307043. The reversal of 21307016 is 61070312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6566 + ... + 9258.

It is an arithmetic number, because the mean of its divisors is an integer number (1333530).

Almost surely, 2^21307016 is an apocalyptic number.

It is an amenable number.

21307016 is an abundant number, since it is smaller than the sum of its proper divisors (21365944).

21307016 is a wasteful number, since it uses less digits than its factorization.

21307016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2765 (or 2761 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 21307016 is about 4615.9523394420. The cubic root of 21307016 is about 277.2304164377.

Adding to 21307016 its reverse (61070312), we get a palindrome (82377328).

The spelling of 21307016 in words is "twenty-one million, three hundred seven thousand, sixteen".