2103424721 has 2 divisors, whose sum is σ = 2103424722. Its totient is φ = 2103424720.

The previous prime is 2103424709. The next prime is 2103424747. The reversal of 2103424721 is 1274243012.

It is an a-pointer prime, because the next prime (2103424747) can be obtained adding 2103424721 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2019244096 + 84180625 = 44936^2 + 9175^2 .

It is a cyclic number.

It is not a de Polignac number, because 2103424721 - 2¹⁴ = 2103408337 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2103414721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051712360 + 1051712361.

It is an arithmetic number, because the mean of its divisors is an integer number (1051712361).

Almost surely, 2^2103424721 is an apocalyptic number.

It is an amenable number.

2103424721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2103424721 is an equidigital number, since it uses as much as digits as its factorization.

2103424721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 2103424721 is about 45863.1084969172. The cubic root of 2103424721 is about 1281.2749180766.

Adding to 2103424721 its reverse (1274243012), we get a palindrome (3377667733).

The spelling of 2103424721 in words is "two billion, one hundred three million, four hundred twenty-four thousand, seven hundred twenty-one".