8421210 has 48 divisors (see below), whose sum is σ = 25024896. Its totient is φ = 1924704.

The previous prime is 8421209. The next prime is 8421227. The reversal of 8421210 is 121248.

8421210 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6054 + ... + 7313.

It is an arithmetic number, because the mean of its divisors is an integer number (521352).

Almost surely, 2^8421210 is an apocalyptic number.

8421210 is an abundant number, since it is smaller than the sum of its proper divisors (16603686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8421210 is a wasteful number, since it uses less digits than its factorization.

8421210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13387 (or 13384 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 8421210 is about 2901.9321149882. The cubic root of 8421210 is about 203.4502209478.

Adding to 8421210 its reverse (121248), we get a palindrome (8542458).

The spelling of 8421210 in words is "eight million, four hundred twenty-one thousand, two hundred ten".