2021003 has 2 divisors, whose sum is σ = 2021004. Its totient is φ = 2021002.

The previous prime is 2020999. The next prime is 2021009. The reversal of 2021003 is 3001202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021003 - 2² = 2020999 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010501 + 1010502.

It is an arithmetic number, because the mean of its divisors is an integer number (1010502).

2^2021003 is an apocalyptic number.

2021003 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021003 is an equidigital number, since it uses as much as digits as its factorization.

2021003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 2021003 is about 1421.6198507337. The cubic root of 2021003 is about 126.4316054532.

Adding to 2021003 its reverse (3001202), we get a palindrome (5022205).

The spelling of 2021003 in words is "two million, twenty-one thousand, three".