2100001003 has 4 divisors (see below), whose sum is σ = 2100105160. Its totient is φ = 2099896848.

The previous prime is 2100000997. The next prime is 2100001021. The reversal of 2100001003 is 3001000012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2100001003 - 2¹⁷ = 2099869931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2100001103) 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, 11073 + ... + 65746.

It is an arithmetic number, because the mean of its divisors is an integer number (525026290).

Almost surely, 2^2100001003 is an apocalyptic number.

2100001003 is a deficient number, since it is larger than the sum of its proper divisors (104157).

2100001003 is an equidigital number, since it uses as much as digits as its factorization.

2100001003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104156.

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

The square root of 2100001003 is about 45825.7678931843. The cubic root of 2100001003 is about 1280.5793688638.

Adding to 2100001003 its reverse (3001000012), we get a palindrome (5101001015).

Subtracting 2100001003 from its reverse (3001000012), we obtain a palindrome (900999009).

The spelling of 2100001003 in words is "two billion, one hundred million, one thousand, three".