9721124850 has 192 divisors, whose sum is σ = 26098329600. Its totient is φ = 2387024640.

The previous prime is 9721124839. The next prime is 9721124857. The reversal of 9721124850 is 584211279.

It is a junction number, because it is equal to n+sod(n) for n = 9721124799 and 9721124808.

It is not an unprimeable number, because it can be changed into a prime (9721124857) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20995719 + ... + 20996181.

It is an arithmetic number, because the mean of its divisors is an integer number (135928800).

Almost surely, 2^9721124850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9721124850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13049164800).

9721124850 is an abundant number, since it is smaller than the sum of its proper divisors (16377204750).

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

9721124850 is a wasteful number, since it uses less digits than its factorization.

9721124850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689 (or 684 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 9721124850 is about 98595.7648684770. The cubic root of 9721124850 is about 2134.2183040337.

The spelling of 9721124850 in words is "nine billion, seven hundred twenty-one million, one hundred twenty-four thousand, eight hundred fifty".