19982921728 has 208 divisors, whose sum is σ = 52766290944. Its totient is φ = 7325614080.

The previous prime is 19982921701. The next prime is 19982921729. The reversal of 19982921728 is 82712928991.

It is not an unprimeable number, because it can be changed into a prime (19982921729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5359801 + ... + 5363527.

Almost surely, 2^19982921728 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 19982921728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26383145472).

19982921728 is an abundant number, since it is smaller than the sum of its proper divisors (32783369216).

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

19982921728 is a wasteful number, since it uses less digits than its factorization.

19982921728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3786 (or 3764 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 58.

The spelling of 19982921728 in words is "nineteen billion, nine hundred eighty-two million, nine hundred twenty-one thousand, seven hundred twenty-eight".