9921871498848 has 96 divisors (see below), whose sum is σ = 26378078146560. Its totient is φ = 3264994836480.

The previous prime is 9921871498841. The next prime is 9921871498849. The reversal of 9921871498848 is 8488941781299.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (78) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921871498841) 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, 60111793 + ... + 60276623.

It is an arithmetic number, because the mean of its divisors is an integer number (274771647360).

Almost surely, 2^{9921871498848} 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 9921871498848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13189039073280).

9921871498848 is an abundant number, since it is smaller than the sum of its proper divisors (16456206647712).

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

9921871498848 is a wasteful number, since it uses less digits than its factorization.

9921871498848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172860 (or 172852 counting only the distinct ones).

The product of its digits is 668860416, while the sum is 78.

The spelling of 9921871498848 in words is "nine trillion, nine hundred twenty-one billion, eight hundred seventy-one million, four hundred ninety-eight thousand, eight hundred forty-eight".