9921170788 has 12 divisors (see below), whose sum is σ = 17371361392. Its totient is φ = 4957924680.

The previous prime is 9921170771. The next prime is 9921170797. The reversal of 9921170788 is 8870711299.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 656778 + ... + 671713.

Almost surely, 2^9921170788 is an apocalyptic number.

It is an amenable number.

9921170788 is a deficient number, since it is larger than the sum of its proper divisors (7450190604).

9921170788 is a wasteful number, since it uses less digits than its factorization.

9921170788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330362 (or 1330360 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 52.

The square root of 9921170788 is about 99605.0741076979. The cubic root of 9921170788 is about 2148.7586696305.

The spelling of 9921170788 in words is "nine billion, nine hundred twenty-one million, one hundred seventy thousand, seven hundred eighty-eight".