8399921807913 has 4 divisors (see below), whose sum is σ = 11199895743888. Its totient is φ = 5599947871940.

The previous prime is 8399921807897. The next prime is 8399921807917. The reversal of 8399921807913 is 3197081299938.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8399921807913 - 2⁴ = 8399921807897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8399921807917) 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 3 ways as a sum of consecutive naturals, for example, 1399986967983 + ... + 1399986967988.

It is an arithmetic number, because the mean of its divisors is an integer number (2799973935972).

Almost surely, 2^{8399921807913} is an apocalyptic number.

It is an amenable number.

8399921807913 is a deficient number, since it is larger than the sum of its proper divisors (2799973935975).

8399921807913 is a wasteful number, since it uses less digits than its factorization.

8399921807913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2799973935974.

The product of its (nonzero) digits is 52907904, while the sum is 69.

The spelling of 8399921807913 in words is "eight trillion, three hundred ninety-nine billion, nine hundred twenty-one million, eight hundred seven thousand, nine hundred thirteen".