8421003 has 10 divisors (see below), whose sum is σ = 12579644. Its totient is φ = 5613948.

The previous prime is 8420983. The next prime is 8421041. The reversal of 8421003 is 3001248.

It is a happy number.

It is not a de Polignac number, because 8421003 - 2⁶ = 8420939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8421403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 51901 + ... + 52062.

Almost surely, 2^8421003 is an apocalyptic number.

8421003 is a deficient number, since it is larger than the sum of its proper divisors (4158641).

8421003 is a wasteful number, since it uses less digits than its factorization.

8421003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103975 (or 103966 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 8421003 is about 2901.8964488761. The cubic root of 8421003 is about 203.4485539450.

The spelling of 8421003 in words is "eight million, four hundred twenty-one thousand, three".