2101803 has 8 divisors (see below), whose sum is σ = 3057216. Its totient is φ = 1273800.

The previous prime is 2101789. The next prime is 2101807. The reversal of 2101803 is 3081012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2101803 - 2¹⁸ = 1839659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2101807) 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 7 ways as a sum of consecutive naturals, for example, 31813 + ... + 31878.

It is an arithmetic number, because the mean of its divisors is an integer number (382152).

2^2101803 is an apocalyptic number.

2101803 is a deficient number, since it is larger than the sum of its proper divisors (955413).

2101803 is a wasteful number, since it uses less digits than its factorization.

2101803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63705.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2101803 is about 1449.7596352499. The cubic root of 2101803 is about 128.0945549713.

Adding to 2101803 its reverse (3081012), we get a palindrome (5182815).

The spelling of 2101803 in words is "two million, one hundred one thousand, eight hundred three".