12103332721 has 2 divisors, whose sum is σ = 12103332722. Its totient is φ = 12103332720.

The previous prime is 12103332673. The next prime is 12103332739. The reversal of 12103332721 is 12723330121.

It is a happy number.

12103332721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11687988321 + 415344400 = 108111^2 + 20380^2 .

It is a cyclic number.

It is not a de Polignac number, because 12103332721 - 2²⁵ = 12069778289 is a prime.

It is not a weakly prime, because it can be changed into another prime (12103332781) 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 as a sum of consecutive naturals, namely, 6051666360 + 6051666361.

It is an arithmetic number, because the mean of its divisors is an integer number (6051666361).

Almost surely, 2^12103332721 is an apocalyptic number.

It is an amenable number.

12103332721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12103332721 is an equidigital number, since it uses as much as digits as its factorization.

12103332721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

Adding to 12103332721 its reverse (12723330121), we get a palindrome (24826662842).

The spelling of 12103332721 in words is "twelve billion, one hundred three million, three hundred thirty-two thousand, seven hundred twenty-one".