2101903 has 2 divisors, whose sum is σ = 2101904. Its totient is φ = 2101902.

The previous prime is 2101873. The next prime is 2101907. The reversal of 2101903 is 3091012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2101903 - 2⁵ = 2101871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050951 + 1050952.

It is an arithmetic number, because the mean of its divisors is an integer number (1050952).

2^2101903 is an apocalyptic number.

2101903 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101903 is an equidigital number, since it uses as much as digits as its factorization.

2101903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 2101903 is about 1449.7941233154. The cubic root of 2101903 is about 128.0965864418.

Adding to 2101903 its reverse (3091012), we get a palindrome (5192915).

The spelling of 2101903 in words is "two million, one hundred one thousand, nine hundred three".