8195612921 has 4 divisors (see below), whose sum is σ = 8369987712. Its totient is φ = 8021238132.

The previous prime is 8195612899. The next prime is 8195612923. The reversal of 8195612921 is 1292165918.

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 8195612921 - 2²² = 8191418617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8195612923) 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, 87187325 + ... + 87187418.

It is an arithmetic number, because the mean of its divisors is an integer number (2092496928).

Almost surely, 2^8195612921 is an apocalyptic number.

It is an amenable number.

8195612921 is a deficient number, since it is larger than the sum of its proper divisors (174374791).

8195612921 is a wasteful number, since it uses less digits than its factorization.

8195612921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174374790.

The product of its digits is 77760, while the sum is 44.

The square root of 8195612921 is about 90529.6245490944. The cubic root of 8195612921 is about 2016.1699901309.

The spelling of 8195612921 in words is "eight billion, one hundred ninety-five million, six hundred twelve thousand, nine hundred twenty-one".