8418021 has 4 divisors (see below), whose sum is σ = 11224032. Its totient is φ = 5612012.

The previous prime is 8418017. The next prime is 8418031. The reversal of 8418021 is 1208148.

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 8418021 - 2² = 8418017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8417982 and 8418000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8418001) 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, 1403001 + ... + 1403006.

It is an arithmetic number, because the mean of its divisors is an integer number (2806008).

Almost surely, 2^8418021 is an apocalyptic number.

It is an amenable number.

8418021 is a deficient number, since it is larger than the sum of its proper divisors (2806011).

8418021 is a wasteful number, since it uses less digits than its factorization.

8418021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2806010.

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 8418021 is about 2901.3826014506. The cubic root of 8418021 is about 203.4245364096.

The spelling of 8418021 in words is "eight million, four hundred eighteen thousand, twenty-one".