421603 has 16 divisors (see below), whose sum is σ = 536256. Its totient is φ = 322560.

The previous prime is 421559. The next prime is 421607. The reversal of 421603 is 306124.

It is not a de Polignac number, because 421603 - 2¹³ = 413411 is a prime.

421603 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (421607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3675 + ... + 3787.

It is an arithmetic number, because the mean of its divisors is an integer number (33516).

2⁴²¹⁶⁰³ is an apocalyptic number.

421603 is a deficient number, since it is larger than the sum of its proper divisors (114653).

421603 is a wasteful number, since it uses less digits than its factorization.

421603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 421603 is about 649.3096333799. The cubic root of 421603 is about 74.9838780162.

Adding to 421603 its reverse (306124), we get a palindrome (727727).

It can be divided in two parts, 421 and 603, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 421603 in words is "four hundred twenty-one thousand, six hundred three".