19821008804 has 6 divisors (see below), whose sum is σ = 34686765414. Its totient is φ = 9910504400.

The previous prime is 19821008797. The next prime is 19821008807. The reversal of 19821008804 is 40880012891.

It can be written as a sum of positive squares in only one way, i.e., 10312808704 + 9508200100 = 101552^2 + 97510^2 .

It is not an unprimeable number, because it can be changed into a prime (19821008807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2477626097 + ... + 2477626104.

It is an arithmetic number, because the mean of its divisors is an integer number (5781127569).

Almost surely, 2^19821008804 is an apocalyptic number.

It is an amenable number.

19821008804 is a deficient number, since it is larger than the sum of its proper divisors (14865756610).

19821008804 is a wasteful number, since it uses less digits than its factorization.

19821008804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4955252205 (or 4955252203 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 41.

The spelling of 19821008804 in words is "nineteen billion, eight hundred twenty-one million, eight thousand, eight hundred four".