2021020103 has 4 divisors (see below), whose sum is σ = 2025843960. Its totient is φ = 2016196248.

The previous prime is 2021020091. The next prime is 2021020147. The reversal of 2021020103 is 3010201202.

It is a happy number.

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 2021020103 - 2⁶ = 2021020039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021020003) 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, 2411300 + ... + 2412137.

It is an arithmetic number, because the mean of its divisors is an integer number (506460990).

Almost surely, 2^2021020103 is an apocalyptic number.

2021020103 is a deficient number, since it is larger than the sum of its proper divisors (4823857).

2021020103 is an equidigital number, since it uses as much as digits as its factorization.

2021020103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4823856.

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

The square root of 2021020103 is about 44955.7571730251. The cubic root of 2021020103 is about 1264.3196210013.

Adding to 2021020103 its reverse (3010201202), we get a palindrome (5031221305).

The spelling of 2021020103 in words is "two billion, twenty-one million, twenty thousand, one hundred three".