6421003 has 4 divisors (see below), whose sum is σ = 6542208. Its totient is φ = 6299800.

The previous prime is 6421001. The next prime is 6421013. The reversal of 6421003 is 3001246.

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

It is a cyclic number.

It is not a de Polignac number, because 6421003 - 2¹ = 6421001 is a prime.

It is a Duffinian number.

6421003 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6421001) 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, 60523 + ... + 60628.

It is an arithmetic number, because the mean of its divisors is an integer number (1635552).

Almost surely, 2^6421003 is an apocalyptic number.

6421003 is a deficient number, since it is larger than the sum of its proper divisors (121205).

6421003 is a wasteful number, since it uses less digits than its factorization.

6421003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121204.

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

The square root of 6421003 is about 2533.9698103963. The cubic root of 6421003 is about 185.8664300993.

Adding to 6421003 its reverse (3001246), we get a palindrome (9422249).

The spelling of 6421003 in words is "six million, four hundred twenty-one thousand, three".