421220 has 12 divisors (see below), whose sum is σ = 884604. Its totient is φ = 168480.

The previous prime is 421207. The next prime is 421241. The reversal of 421220 is 22124.

421220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 322624 + 98596 = 568^2 + 314^2 .

It is an unprimeable number.

421220 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10511 + ... + 10550.

It is an arithmetic number, because the mean of its divisors is an integer number (73717).

2⁴²¹²²⁰ is an apocalyptic number.

It is an amenable number.

421220 is an abundant number, since it is smaller than the sum of its proper divisors (463384).

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

421220 is a wasteful number, since it uses less digits than its factorization.

421220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21070 (or 21068 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 421220 is about 649.0146377394. The cubic root of 421220 is about 74.9611650800.

Adding to 421220 its reverse (22124), we get a palindrome (443344).

The spelling of 421220 in words is "four hundred twenty-one thousand, two hundred twenty", and thus it is an iban number.