9921688007 has 8 divisors (see below), whose sum is σ = 12369896832. Its totient is φ = 7731185400.

The previous prime is 9921688001. The next prime is 9921688009. The reversal of 9921688007 is 7008861299.

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

It is a cyclic number.

It is not a de Polignac number, because 9921688007 - 2⁴ = 9921687991 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 (9921688001) 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, 64426469 + ... + 64426622.

It is an arithmetic number, because the mean of its divisors is an integer number (1546237104).

Almost surely, 2^9921688007 is an apocalyptic number.

9921688007 is a deficient number, since it is larger than the sum of its proper divisors (2448208825).

9921688007 is a wasteful number, since it uses less digits than its factorization.

9921688007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128853109.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 9921688007 is about 99607.6704225131. The cubic root of 9921688007 is about 2148.7960092927.

The spelling of 9921688007 in words is "nine billion, nine hundred twenty-one million, six hundred eighty-eight thousand, seven".