8105170421 has 4 divisors (see below), whose sum is σ = 8107757292. Its totient is φ = 8102583552.

The previous prime is 8105170417. The next prime is 8105170453. The reversal of 8105170421 is 1240715018.

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 7226700100 + 878470321 = 85010^2 + 29639^2 .

It is a cyclic number.

It is not a de Polignac number, because 8105170421 - 2² = 8105170417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8105170471) 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, 1288730 + ... + 1295003.

It is an arithmetic number, because the mean of its divisors is an integer number (2026939323).

Almost surely, 2^8105170421 is an apocalyptic number.

It is an amenable number.

8105170421 is a deficient number, since it is larger than the sum of its proper divisors (2586871).

8105170421 is a wasteful number, since it uses less digits than its factorization.

8105170421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2586870.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 8105170421 is about 90028.7199786824. The cubic root of 8105170421 is about 2008.7260741945.

Adding to 8105170421 its reverse (1240715018), we get a palindrome (9345885439).

The spelling of 8105170421 in words is "eight billion, one hundred five million, one hundred seventy thousand, four hundred twenty-one".