9821517372 has 72 divisors (see below), whose sum is σ = 26314470000. Its totient is φ = 3078041088.

The previous prime is 9821517367. The next prime is 9821517413. The reversal of 9821517372 is 2737151289.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 615754 + ... + 631502.

It is an arithmetic number, because the mean of its divisors is an integer number (365478750).

Almost surely, 2^9821517372 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9821517372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13157235000).

9821517372 is an abundant number, since it is smaller than the sum of its proper divisors (16492952628).

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

9821517372 is a wasteful number, since it uses less digits than its factorization.

9821517372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16795 (or 16790 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 9821517372 is about 99103.5689165632. The cubic root of 9821517372 is about 2141.5400283951.

The spelling of 9821517372 in words is "nine billion, eight hundred twenty-one million, five hundred seventeen thousand, three hundred seventy-two".