8340388921 has 16 divisors (see below), whose sum is σ = 8908099200. Its totient is φ = 7781379840.

The previous prime is 8340388873. The next prime is 8340389033. The reversal of 8340388921 is 1298830438.

It is a cyclic number.

It is not a de Polignac number, because 8340388921 - 2¹³ = 8340380729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8340388321) 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, 3114235 + ... + 3116911.

It is an arithmetic number, because the mean of its divisors is an integer number (556756200).

Almost surely, 2^8340388921 is an apocalyptic number.

It is an amenable number.

8340388921 is a deficient number, since it is larger than the sum of its proper divisors (567710279).

8340388921 is a wasteful number, since it uses less digits than its factorization.

8340388921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4224.

The product of its (nonzero) digits is 331776, while the sum is 46.

The square root of 8340388921 is about 91325.7297862985. The cubic root of 8340388921 is about 2027.9726839095.

The spelling of 8340388921 in words is "eight billion, three hundred forty million, three hundred eighty-eight thousand, nine hundred twenty-one".