21016607 has 8 divisors (see below), whose sum is σ = 22536000. Its totient is φ = 19528704.

The previous prime is 21016601. The next prime is 21016609. The reversal of 21016607 is 70661012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21016607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21016601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6482 + ... + 9167.

It is an arithmetic number, because the mean of its divisors is an integer number (2817000).

Almost surely, 2^21016607 is an apocalyptic number.

21016607 is a deficient number, since it is larger than the sum of its proper divisors (1519393).

21016607 is a wasteful number, since it uses less digits than its factorization.

21016607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15745.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 21016607 is about 4584.3873091178. The cubic root of 21016607 is about 275.9651245928.

Adding to 21016607 its reverse (70661012), we get a palindrome (91677619).

The spelling of 21016607 in words is "twenty-one million, sixteen thousand, six hundred seven".