2003121013 has 4 divisors (see below), whose sum is σ = 2021498380. Its totient is φ = 1984743648.

The previous prime is 2003121007. The next prime is 2003121049. The reversal of 2003121013 is 3101213002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1488647889 + 514473124 = 38583^2 + 22682^2 .

It is a cyclic number.

It is not a de Polignac number, because 2003121013 - 2¹⁷ = 2002989941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2003120984 and 2003121002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2003121613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9188520 + ... + 9188737.

It is an arithmetic number, because the mean of its divisors is an integer number (505374595).

Almost surely, 2^2003121013 is an apocalyptic number.

It is an amenable number.

2003121013 is a deficient number, since it is larger than the sum of its proper divisors (18377367).

2003121013 is a wasteful number, since it uses less digits than its factorization.

2003121013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18377366.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 2003121013 is about 44756.2399336674. The cubic root of 2003121013 is about 1260.5760809488.

Adding to 2003121013 its reverse (3101213002), we get a palindrome (5104334015).

It can be divided in two parts, 200 and 3121013, that added together give a palindrome (3121213).

The spelling of 2003121013 in words is "two billion, three million, one hundred twenty-one thousand, thirteen".