421003 has 4 divisors (see below), whose sum is σ = 459288. Its totient is φ = 382720.

The previous prime is 420997. The next prime is 421009. The reversal of 421003 is 300124.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (420997) and next prime (421009).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421003 is a prime.

It is a Duffinian number.

421003 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (421009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19126 + ... + 19147.

It is an arithmetic number, because the mean of its divisors is an integer number (114822).

2⁴²¹⁰⁰³ is an apocalyptic number.

421003 is a deficient number, since it is larger than the sum of its proper divisors (38285).

421003 is a wasteful number, since it uses less digits than its factorization.

421003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38284.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 421003 is about 648.8474396960. The cubic root of 421003 is about 74.9482902822.

Adding to 421003 its reverse (300124), we get a palindrome (721127).

The spelling of 421003 in words is "four hundred twenty-one thousand, three", and thus it is an iban number.