2103424021 has 4 divisors (see below), whose sum is σ = 2137906444. Its totient is φ = 2068941600.

The previous prime is 2103424003. The next prime is 2103424049. The reversal of 2103424021 is 1204243012.

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 961930225 + 1141493796 = 31015^2 + 33786^2 .

It is a cyclic number.

It is not a de Polignac number, because 2103424021 - 2¹⁵ = 2103391253 is a prime.

It is a super-2 number, since 2×2103424021² = 8848785224239616882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2103424021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2103424721) 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, 17241120 + ... + 17241241.

It is an arithmetic number, because the mean of its divisors is an integer number (534476611).

Almost surely, 2^2103424021 is an apocalyptic number.

It is an amenable number.

2103424021 is a deficient number, since it is larger than the sum of its proper divisors (34482423).

2103424021 is an equidigital number, since it uses as much as digits as its factorization.

2103424021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34482422.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 2103424021 is about 45863.1008655106. The cubic root of 2103424021 is about 1281.2747759445.

Adding to 2103424021 its reverse (1204243012), we get a palindrome (3307667033).

The spelling of 2103424021 in words is "two billion, one hundred three million, four hundred twenty-four thousand, twenty-one".