2003102021 has 4 divisors (see below), whose sum is σ = 2003600544. Its totient is φ = 2002603500.

The previous prime is 2003102011. The next prime is 2003102033. The reversal of 2003102021 is 1202013002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1202013002 = 2 ⋅601006501.

It is a cyclic number.

It is not a de Polignac number, because 2003102021 - 2²² = 1998907717 is a prime.

It is a super-5 number, since 5×2003102021⁵ (a number of 48 digits) contains 55555 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2003101993 and 2003102011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2003102011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243185 + ... + 251286.

It is an arithmetic number, because the mean of its divisors is an integer number (500900136).

Almost surely, 2^2003102021 is an apocalyptic number.

It is an amenable number.

2003102021 is a deficient number, since it is larger than the sum of its proper divisors (498523).

2003102021 is an equidigital number, since it uses as much as digits as its factorization.

2003102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498522.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 2003102021 is about 44756.0277616323. The cubic root of 2003102021 is about 1260.5720970097.

Adding to 2003102021 its reverse (1202013002), we get a palindrome (3205115023).

The spelling of 2003102021 in words is "two billion, three million, one hundred two thousand, twenty-one".