2003101021 has 4 divisors (see below), whose sum is σ = 2072173500. Its totient is φ = 1934028544.

The previous prime is 2003101003. The next prime is 2003101031. The reversal of 2003101021 is 1201013002.

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 1426572900 + 576528121 = 37770^2 + 24011^2 .

It is a cyclic number.

It is not a de Polignac number, because 2003101021 - 2¹¹ = 2003098973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2003100989 and 2003101007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2003101031) 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, 34536196 + ... + 34536253.

It is an arithmetic number, because the mean of its divisors is an integer number (518043375).

Almost surely, 2^2003101021 is an apocalyptic number.

It is an amenable number.

2003101021 is a deficient number, since it is larger than the sum of its proper divisors (69072479).

2003101021 is an equidigital number, since it uses as much as digits as its factorization.

2003101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69072478.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 2003101021 is about 44756.0165899513. The cubic root of 2003101021 is about 1260.5718872397.

Adding to 2003101021 its reverse (1201013002), we get a palindrome (3204114023).

The spelling of 2003101021 in words is "two billion, three million, one hundred one thousand, twenty-one".