2120903 has 4 divisors (see below), whose sum is σ = 2245680. Its totient is φ = 1996128.

The previous prime is 2120891. The next prime is 2120917. The reversal of 2120903 is 3090212.

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 2120903 - 2⁴ = 2120887 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 124759 = 2120903 / (2 + 1 + 2 + 0 + 9 + 0 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120933) 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, 62363 + ... + 62396.

It is an arithmetic number, because the mean of its divisors is an integer number (561420).

2^2120903 is an apocalyptic number.

2120903 is a deficient number, since it is larger than the sum of its proper divisors (124777).

2120903 is a wasteful number, since it uses less digits than its factorization.

2120903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124776.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 2120903 is about 1456.3320363159. The cubic root of 2120903 is about 128.4814025279.

The spelling of 2120903 in words is "two million, one hundred twenty thousand, nine hundred three".