9813985421500 has 192 divisors, whose sum is σ = 24520307011200. Its totient is φ = 3401409024000.

The previous prime is 9813985421491. The next prime is 9813985421503. The reversal of 9813985421500 is 51245893189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9813985421503) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13096980 + ... + 13826020.

It is an arithmetic number, because the mean of its divisors is an integer number (127709932350).

Almost surely, 2^{9813985421500} 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 9813985421500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12260153505600).

9813985421500 is an abundant number, since it is smaller than the sum of its proper divisors (14706321589700).

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

9813985421500 is a wasteful number, since it uses less digits than its factorization.

9813985421500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729201 (or 729189 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 55.

The spelling of 9813985421500 in words is "nine trillion, eight hundred thirteen billion, nine hundred eighty-five million, four hundred twenty-one thousand, five hundred".