421218 has 24 divisors (see below), whose sum is σ = 1043328. Its totient is φ = 120312.

The previous prime is 421207. The next prime is 421241. The reversal of 421218 is 812124.

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

It is a zygodrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 421218.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1546 + ... + 1797.

It is an arithmetic number, because the mean of its divisors is an integer number (43472).

2⁴²¹²¹⁸ is an apocalyptic number.

421218 is an abundant number, since it is smaller than the sum of its proper divisors (622110).

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

421218 is a wasteful number, since it uses less digits than its factorization.

421218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3358 (or 3355 counting only the distinct ones).

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

The square root of 421218 is about 649.0130969403. The cubic root of 421218 is about 74.9610464384.

The spelling of 421218 in words is "four hundred twenty-one thousand, two hundred eighteen".