12721103 has 2 divisors, whose sum is σ = 12721104. Its totient is φ = 12721102.

The previous prime is 12721099. The next prime is 12721147. The reversal of 12721103 is 30112721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12721103 - 2² = 12721099 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12721183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6360551 + 6360552.

It is an arithmetic number, because the mean of its divisors is an integer number (6360552).

Almost surely, 2^12721103 is an apocalyptic number.

12721103 is a deficient number, since it is larger than the sum of its proper divisors (1).

12721103 is an equidigital number, since it uses as much as digits as its factorization.

12721103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 12721103 is about 3566.6655295948. The cubic root of 12721103 is about 233.4398110405.

Adding to 12721103 its reverse (30112721), we get a palindrome (42833824).

The spelling of 12721103 in words is "twelve million, seven hundred twenty-one thousand, one hundred three".