2003121011 has 4 divisors (see below), whose sum is σ = 2004484224. Its totient is φ = 2001757800.

The previous prime is 2003121007. The next prime is 2003121049. The reversal of 2003121011 is 1101213002.

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 2003121011 - 2² = 2003121007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2003120983 and 2003121001.

It is not an unprimeable number, because it can be changed into a prime (2003121511) 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, 679400 + ... + 682341.

It is an arithmetic number, because the mean of its divisors is an integer number (501121056).

Almost surely, 2^2003121011 is an apocalyptic number.

2003121011 is a deficient number, since it is larger than the sum of its proper divisors (1363213).

2003121011 is a wasteful number, since it uses less digits than its factorization.

2003121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363212.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 2003121011 is about 44756.2399113241. The cubic root of 2003121011 is about 1260.5760805293.

Adding to 2003121011 its reverse (1101213002), we get a palindrome (3104334013).

The spelling of 2003121011 in words is "two billion, three million, one hundred twenty-one thousand, eleven".