8122693921 has 4 divisors (see below), whose sum is σ = 8164780612. Its totient is φ = 8080607232.

The previous prime is 8122693877. The next prime is 8122693949. The reversal of 8122693921 is 1293962218.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2048829696 + 6073864225 = 45264^2 + 77935^2 .

It is a cyclic number.

It is not a de Polignac number, because 8122693921 - 2¹³ = 8122685729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8122691921) 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, 21043056 + ... + 21043441.

It is an arithmetic number, because the mean of its divisors is an integer number (2041195153).

Almost surely, 2^8122693921 is an apocalyptic number.

It is an amenable number.

8122693921 is a deficient number, since it is larger than the sum of its proper divisors (42086691).

8122693921 is a wasteful number, since it uses less digits than its factorization.

8122693921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42086690.

The product of its digits is 93312, while the sum is 43.

The square root of 8122693921 is about 90125.9891540725. The cubic root of 8122693921 is about 2010.1726641439.

The spelling of 8122693921 in words is "eight billion, one hundred twenty-two million, six hundred ninety-three thousand, nine hundred twenty-one".