19827971522 has 18 divisors (see below), whose sum is σ = 31599792747. Its totient is φ = 9329217024.

The previous prime is 19827971521. The next prime is 19827971543. The reversal of 19827971522 is 22517972891.

It can be written as a sum of positive squares in 5 ways, for example, as 19757394721 + 70576801 = 140561^2 + 8401^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=99569.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19827971521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3382418 + ... + 3388274.

Almost surely, 2^19827971522 is an apocalyptic number.

19827971522 is a deficient number, since it is larger than the sum of its proper divisors (11771821225).

19827971522 is an frugal number, since it uses more digits than its factorization.

19827971522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11750 (or 5876 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 53.

The spelling of 19827971522 in words is "nineteen billion, eight hundred twenty-seven million, nine hundred seventy-one thousand, five hundred twenty-two".