2100003 has 4 divisors (see below), whose sum is σ = 2800008. Its totient is φ = 1400000.

The previous prime is 2100001. The next prime is 2100011. The reversal of 2100003 is 3000012.

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 2100003 - 2¹ = 2100001 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 2099964 and 2100000.

It is not an unprimeable number, because it can be changed into a prime (2100001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 349998 + ... + 350003.

It is an arithmetic number, because the mean of its divisors is an integer number (700002).

2^2100003 is an apocalyptic number.

2100003 is a deficient number, since it is larger than the sum of its proper divisors (700005).

2100003 is an equidigital number, since it uses as much as digits as its factorization.

2100003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700004.

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

The square root of 2100003 is about 1449.1387097169. The cubic root of 2100003 is about 128.0579774787.

Adding to 2100003 its reverse (3000012), we get a palindrome (5100015).

Subtracting 2100003 from its reverse (3000012), we obtain a palindrome (900009).

The spelling of 2100003 in words is "two million, one hundred thousand, three".