19821328452 has 72 divisors (see below), whose sum is σ = 53100079200. Its totient is φ = 6393943440.

The previous prime is 19821328433. The next prime is 19821328459. The reversal of 19821328452 is 25482312891.

19821328452 is a `hidden beast` number, since 198 + 2 + 1 + 3 + 2 + 8 + 452 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 19821328398 and 19821328407.

It is not an unprimeable number, because it can be changed into a prime (19821328459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8299 + ... + 199277.

It is an arithmetic number, because the mean of its divisors is an integer number (737501100).

Almost surely, 2^19821328452 is an apocalyptic number.

19821328452 is a gapful number since it is divisible by the number (12) 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 19821328452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26550039600).

19821328452 is an abundant number, since it is smaller than the sum of its proper divisors (33278750748).

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

19821328452 is a wasteful number, since it uses less digits than its factorization.

19821328452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191054 (or 191015 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The spelling of 19821328452 in words is "nineteen billion, eight hundred twenty-one million, three hundred twenty-eight thousand, four hundred fifty-two".