9921165147 has 36 divisors (see below), whose sum is σ = 15245391720. Its totient is φ = 6376376160.

The previous prime is 9921165131. The next prime is 9921165157. The reversal of 9921165147 is 7415611299.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 9921165147 - 2⁴ = 9921165131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9921165157) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 15008997 + ... + 15009657.

Almost surely, 2^9921165147 is an apocalyptic number.

9921165147 is a deficient number, since it is larger than the sum of its proper divisors (5324226573).

9921165147 is an frugal number, since it uses more digits than its factorization.

9921165147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389 (or 693 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 9921165147 is about 99605.0457908634. The cubic root of 9921165147 is about 2148.7582623818.

The spelling of 9921165147 in words is "nine billion, nine hundred twenty-one million, one hundred sixty-five thousand, one hundred forty-seven".