19821145443 has 8 divisors (see below), whose sum is σ = 28830757056. Its totient is φ = 12012815400.

The previous prime is 19821145433. The next prime is 19821145451. The reversal of 19821145443 is 34454112891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19821145443 - 2¹⁴ = 19821129059 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19821145395 and 19821145404.

It is not an unprimeable number, because it can be changed into a prime (19821145433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300320353 + ... + 300320418.

It is an arithmetic number, because the mean of its divisors is an integer number (3603844632).

Almost surely, 2^19821145443 is an apocalyptic number.

19821145443 is a deficient number, since it is larger than the sum of its proper divisors (9009611613).

19821145443 is a wasteful number, since it uses less digits than its factorization.

19821145443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600640785.

The product of its digits is 138240, while the sum is 42.

The spelling of 19821145443 in words is "nineteen billion, eight hundred twenty-one million, one hundred forty-five thousand, four hundred forty-three".