8421211 has 4 divisors (see below), whose sum is σ = 8429800. Its totient is φ = 8412624.

The previous prime is 8421209. The next prime is 8421227. The reversal of 8421211 is 1121248.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8421211 - 2¹ = 8421209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8421241) 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, 2601 + ... + 4858.

It is an arithmetic number, because the mean of its divisors is an integer number (2107450).

Almost surely, 2^8421211 is an apocalyptic number.

8421211 is a deficient number, since it is larger than the sum of its proper divisors (8589).

8421211 is a wasteful number, since it uses less digits than its factorization.

8421211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8588.

The product of its digits is 128, while the sum is 19.

The square root of 8421211 is about 2901.9322872872. The cubic root of 8421211 is about 203.4502290009.

Adding to 8421211 its reverse (1121248), we get a palindrome (9542459).

The spelling of 8421211 in words is "eight million, four hundred twenty-one thousand, two hundred eleven".