2103112021 has 4 divisors (see below), whose sum is σ = 2103335200. Its totient is φ = 2102888844.

The previous prime is 2103111949. The next prime is 2103112049. The reversal of 2103112021 is 1202113012.

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.

It is a cyclic number.

It is not a de Polignac number, because 2103112021 - 2⁷ = 2103111893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2103111992 and 2103112010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2103182021) 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, 96801 + ... + 116518.

It is an arithmetic number, because the mean of its divisors is an integer number (525833800).

Almost surely, 2^2103112021 is an apocalyptic number.

It is an amenable number.

2103112021 is a deficient number, since it is larger than the sum of its proper divisors (223179).

2103112021 is an equidigital number, since it uses as much as digits as its factorization.

2103112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223178.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2103112021 is about 45859.6993121412. The cubic root of 2103112021 is about 1281.2114224958.

Adding to 2103112021 its reverse (1202113012), we get a palindrome (3305225033).

Subtracting from 2103112021 its reverse (1202113012), we obtain a palindrome (900999009).

The spelling of 2103112021 in words is "two billion, one hundred three million, one hundred twelve thousand, twenty-one".