1003021 has 4 divisors (see below), whose sum is σ = 1008412. Its totient is φ = 997632.

The previous prime is 1003019. The next prime is 1003039. The reversal of 1003021 is 1203001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1203001 = 107 ⋅11243.

It can be written as a sum of positive squares in 2 ways, for example, as 346921 + 656100 = 589^2 + 810^2 .

It is a cyclic number.

It is not a de Polignac number, because 1003021 - 2¹ = 1003019 is a prime.

It is a super-2 number, since 2×1003021² = 2012102252882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002995 and 1003013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1003001) 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 3 ways as a sum of consecutive naturals, for example, 2406 + ... + 2791.

It is an arithmetic number, because the mean of its divisors is an integer number (252103).

2^1003021 is an apocalyptic number.

It is an amenable number.

1003021 is a deficient number, since it is larger than the sum of its proper divisors (5391).

1003021 is an equidigital number, since it uses as much as digits as its factorization.

1003021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5390.

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 1003021 is about 1001.5093609148. The cubic root of 1003021 is about 100.1005987649.

Adding to 1003021 its reverse (1203001), we get a palindrome (2206022).

The spelling of 1003021 in words is "one million, three thousand, twenty-one".