21016107 has 12 divisors (see below), whose sum is σ = 34693360. Its totient is φ = 12009168.

The previous prime is 21016103. The next prime is 21016123. The reversal of 21016107 is 70161012.

It is not a de Polignac number, because 21016107 - 2² = 21016103 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21016107.

It is not an unprimeable number, because it can be changed into a prime (21016103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 166732 + ... + 166857.

Almost surely, 2^21016107 is an apocalyptic number.

21016107 is a deficient number, since it is larger than the sum of its proper divisors (13677253).

21016107 is a wasteful number, since it uses less digits than its factorization.

21016107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333602 (or 333599 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 21016107 is about 4584.3327758792. The cubic root of 21016107 is about 275.9629361067.

Adding to 21016107 its reverse (70161012), we get a palindrome (91177119).

The spelling of 21016107 in words is "twenty-one million, sixteen thousand, one hundred seven".