12721691503 has 2 divisors, whose sum is σ = 12721691504. Its totient is φ = 12721691502.

The previous prime is 12721691501. The next prime is 12721691527. The reversal of 12721691503 is 30519612721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12721691503 - 2¹ = 12721691501 is a prime.

Together with 12721691501, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12721691501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6360845751 + 6360845752.

It is an arithmetic number, because the mean of its divisors is an integer number (6360845752).

Almost surely, 2^12721691503 is an apocalyptic number.

12721691503 is a deficient number, since it is larger than the sum of its proper divisors (1).

12721691503 is an equidigital number, since it uses as much as digits as its factorization.

12721691503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 12721691503 in words is "twelve billion, seven hundred twenty-one million, six hundred ninety-one thousand, five hundred three".