8146801921 has 4 divisors (see below), whose sum is σ = 8177087700. Its totient is φ = 8116516144.

The previous prime is 8146801913. The next prime is 8146801933. The reversal of 8146801921 is 1291086418.

8146801921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1291086418 = 2 ⋅645543209.

It can be written as a sum of positive squares in 2 ways, for example, as 5046539521 + 3100262400 = 71039^2 + 55680^2 .

It is a cyclic number.

It is not a de Polignac number, because 8146801921 - 2³ = 8146801913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8146801961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15142486 + ... + 15143023.

It is an arithmetic number, because the mean of its divisors is an integer number (2044271925).

Almost surely, 2^8146801921 is an apocalyptic number.

It is an amenable number.

8146801921 is a deficient number, since it is larger than the sum of its proper divisors (30285779).

8146801921 is a wasteful number, since it uses less digits than its factorization.

8146801921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30285778.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 8146801921 is about 90259.6361670044. The cubic root of 8146801921 is about 2012.1594178795.

The spelling of 8146801921 in words is "eight billion, one hundred forty-six million, eight hundred one thousand, nine hundred twenty-one".