8118421 has 4 divisors (see below), whose sum is σ = 8147392. Its totient is φ = 8089452.

The previous prime is 8118413. The next prime is 8118433. The reversal of 8118421 is 1248118.

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 8118421 - 2³ = 8118413 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 (8113421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14061 + ... + 14626.

It is an arithmetic number, because the mean of its divisors is an integer number (2036848).

Almost surely, 2^8118421 is an apocalyptic number.

It is an amenable number.

8118421 is a deficient number, since it is larger than the sum of its proper divisors (28971).

8118421 is a wasteful number, since it uses less digits than its factorization.

8118421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28970.

The product of its digits is 512, while the sum is 25.

The square root of 8118421 is about 2849.2842960996. The cubic root of 8118421 is about 200.9820120368.

The spelling of 8118421 in words is "eight million, one hundred eighteen thousand, four hundred twenty-one".