12721503 has 4 divisors (see below), whose sum is σ = 16962008. Its totient is φ = 8481000.

The previous prime is 12721477. The next prime is 12721519. The reversal of 12721503 is 30512721.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12721503 - 2¹⁰ = 12720479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12721503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721523) 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 in 3 ways as a sum of consecutive naturals, for example, 2120248 + ... + 2120253.

It is an arithmetic number, because the mean of its divisors is an integer number (4240502).

Almost surely, 2^12721503 is an apocalyptic number.

12721503 is a deficient number, since it is larger than the sum of its proper divisors (4240505).

12721503 is an equidigital number, since it uses as much as digits as its factorization.

12721503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4240504.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 12721503 is about 3566.7216039383. The cubic root of 12721503 is about 233.4422577609.

It can be divided in two parts, 1272 and 1503, that added together give a triangular number (2775 = T₇₄).

The spelling of 12721503 in words is "twelve million, seven hundred twenty-one thousand, five hundred three".