2103305021 has 2 divisors, whose sum is σ = 2103305022. Its totient is φ = 2103305020.

The previous prime is 2103304969. The next prime is 2103305023. The reversal of 2103305021 is 1205033012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2066702521 + 36602500 = 45461^2 + 6050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2103305021 is a prime.

It is a super-2 number, since 2×2103305021² = 8847784022727620882, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 2103305023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2103305023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051652510 + 1051652511.

It is an arithmetic number, because the mean of its divisors is an integer number (1051652511).

Almost surely, 2^2103305021 is an apocalyptic number.

It is an amenable number.

2103305021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2103305021 is an equidigital number, since it uses as much as digits as its factorization.

2103305021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 2103305021 is about 45861.8035079302. The cubic root of 2103305021 is about 1281.2506130285.

Adding to 2103305021 its reverse (1205033012), we get a palindrome (3308338033).

The spelling of 2103305021 in words is "two billion, one hundred three million, three hundred five thousand, twenty-one".