2101603 has 4 divisors (see below), whose sum is σ = 2401840. Its totient is φ = 1801368.

The previous prime is 2101553. The next prime is 2101607. The reversal of 2101603 is 3061012.

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 2101603 - 2⁹ = 2101091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2101607) 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, 150108 + ... + 150121.

It is an arithmetic number, because the mean of its divisors is an integer number (600460).

2^2101603 is an apocalyptic number.

2101603 is a deficient number, since it is larger than the sum of its proper divisors (300237).

2101603 is an equidigital number, since it uses as much as digits as its factorization.

2101603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300236.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 2101603 is about 1449.6906566575. The cubic root of 2101603 is about 128.0904918370.

Adding to 2101603 its reverse (3061012), we get a palindrome (5162615).

It can be divided in two parts, 2101 and 603, that added together give a square (2704 = 52²).

The spelling of 2101603 in words is "two million, one hundred one thousand, six hundred three".