9999921939020 has 192 divisors, whose sum is σ = 23686147989504. Its totient is φ = 3518649953280.

The previous prime is 9999921939017. The next prime is 9999921939037. The reversal of 9999921939020 is 209391299999.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2057171390 + ... + 2057176250.

It is an arithmetic number, because the mean of its divisors is an integer number (123365354112).

Almost surely, 2^{9999921939020} 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 9999921939020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11843073994752).

9999921939020 is an abundant number, since it is smaller than the sum of its proper divisors (13686226050484).

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

9999921939020 is a wasteful number, since it uses less digits than its factorization.

9999921939020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6112 (or 6110 counting only the distinct ones).

The product of its (nonzero) digits is 57395628, while the sum is 71.

The spelling of 9999921939020 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred twenty-one million, nine hundred thirty-nine thousand, twenty".