19990221600 has 144 divisors (see below), whose sum is σ = 65181140640. Its totient is φ = 5321472000.

The previous prime is 19990221593. The next prime is 19990221631. The reversal of 19990221600 is 612209991.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1435471 + ... + 1449329.

It is an arithmetic number, because the mean of its divisors is an integer number (452646810).

Almost surely, 2^19990221600 is an apocalyptic number.

19990221600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19990221600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32590570320).

19990221600 is an abundant number, since it is smaller than the sum of its proper divisors (45190919040).

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

19990221600 is a wasteful number, since it uses less digits than its factorization.

19990221600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14483 (or 14470 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 39.

The spelling of 19990221600 in words is "nineteen billion, nine hundred ninety million, two hundred twenty-one thousand, six hundred".