19821609036 has 48 divisors (see below), whose sum is σ = 52584470400. Its totient is φ = 6453545616.

The previous prime is 19821609029. The next prime is 19821609089. The reversal of 19821609036 is 63090612891.

It is a happy number.

19821609036 is a `hidden beast` number, since 1 + 9 + 8 + 2 + 1 + 609 + 0 + 36 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 19821608982 and 19821609000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2129466 + ... + 2138753.

It is an arithmetic number, because the mean of its divisors is an integer number (1095509800).

Almost surely, 2^19821609036 is an apocalyptic number.

It is an amenable number.

19821609036 is an abundant number, since it is smaller than the sum of its proper divisors (32762861364).

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

19821609036 is a wasteful number, since it uses less digits than its factorization.

19821609036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4268275 (or 4268267 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The spelling of 19821609036 in words is "nineteen billion, eight hundred twenty-one million, six hundred nine thousand, thirty-six".