2003121 has 12 divisors (see below), whose sum is σ = 2917200. Its totient is φ = 1324440.

The previous prime is 2003119. The next prime is 2003149. The reversal of 2003121 is 1213002.

It is a happy number.

It is not a de Polignac number, because 2003121 - 2¹ = 2003119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2003191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 330 + ... + 2028.

It is an arithmetic number, because the mean of its divisors is an integer number (243100).

2^2003121 is an apocalyptic number.

It is an amenable number.

2003121 is a deficient number, since it is larger than the sum of its proper divisors (914079).

2003121 is a wasteful number, since it uses less digits than its factorization.

2003121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836 (or 1833 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 2003121 is about 1415.3165723611. The cubic root of 2003121 is about 126.0576078222.

Adding to 2003121 its reverse (1213002), we get a palindrome (3216123).

It can be divided in two parts, 200 and 3121, that added together give a triangular number (3321 = T₈₁).

The spelling of 2003121 in words is "two million, three thousand, one hundred twenty-one".