9921699504 has 80 divisors (see below), whose sum is σ = 28490855040. Its totient is φ = 3305851200.

The previous prime is 9921699503. The next prime is 9921699521. The reversal of 9921699504 is 4059961299.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (9921699503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1961779 + ... + 1966829.

It is an arithmetic number, because the mean of its divisors is an integer number (356135688).

Almost surely, 2^9921699504 is an apocalyptic number.

It is an amenable number.

9921699504 is an abundant number, since it is smaller than the sum of its proper divisors (18569155536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9921699504 is a wasteful number, since it uses less digits than its factorization.

9921699504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9615 (or 9603 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 54.

The square root of 9921699504 is about 99607.7281339154. The cubic root of 9921699504 is about 2148.7968392824.

The spelling of 9921699504 in words is "nine billion, nine hundred twenty-one million, six hundred ninety-nine thousand, five hundred four".