2121903 has 32 divisors (see below), whose sum is σ = 3660800. Its totient is φ = 1189728.

The previous prime is 2121893. The next prime is 2121907. The reversal of 2121903 is 3091212.

It is a happy number.

It is not a de Polignac number, because 2121903 - 2¹⁰ = 2120879 is a prime.

It is a Duffinian number.

2121903 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121907) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19413 + ... + 19521.

It is an arithmetic number, because the mean of its divisors is an integer number (114400).

2^2121903 is an apocalyptic number.

2121903 is a deficient number, since it is larger than the sum of its proper divisors (1538897).

2121903 is a wasteful number, since it uses less digits than its factorization.

2121903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 2121903 is about 1456.6753241543. The cubic root of 2121903 is about 128.5015922325.

The spelling of 2121903 in words is "two million, one hundred twenty-one thousand, nine hundred three".