9921347807 has 8 divisors (see below), whose sum is σ = 11363940000. Its totient is φ = 8485069824.

The previous prime is 9921347797. The next prime is 9921347831. The reversal of 9921347807 is 7087431299.

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

It is not a de Polignac number, because 9921347807 - 2⁴ = 9921347791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921347837) 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, 1575182 + ... + 1581467.

It is an arithmetic number, because the mean of its divisors is an integer number (1420492500).

Almost surely, 2^9921347807 is an apocalyptic number.

9921347807 is a deficient number, since it is larger than the sum of its proper divisors (1442592193).

9921347807 is a wasteful number, since it uses less digits than its factorization.

9921347807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3157105.

The product of its (nonzero) digits is 762048, while the sum is 50.

The square root of 9921347807 is about 99605.9627080628. The cubic root of 9921347807 is about 2148.7714493335.

The spelling of 9921347807 in words is "nine billion, nine hundred twenty-one million, three hundred forty-seven thousand, eight hundred seven".