19364788821 has 16 divisors (see below), whose sum is σ = 29510208128. Its totient is φ = 11064859200.

The previous prime is 19364788787. The next prime is 19364788829. The reversal of 19364788821 is 12888746391.

It is not a de Polignac number, because 19364788821 - 2¹⁰ = 19364787797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19364788829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 546051 + ... + 580431.

It is an arithmetic number, because the mean of its divisors is an integer number (1844388008).

Almost surely, 2^19364788821 is an apocalyptic number.

It is an amenable number.

19364788821 is a deficient number, since it is larger than the sum of its proper divisors (10145419307).

19364788821 is a wasteful number, since it uses less digits than its factorization.

19364788821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61212.

The product of its digits is 4644864, while the sum is 57.

The spelling of 19364788821 in words is "nineteen billion, three hundred sixty-four million, seven hundred eighty-eight thousand, eight hundred twenty-one".