12721691527 has 2 divisors, whose sum is σ = 12721691528. Its totient is φ = 12721691526.

The previous prime is 12721691503. The next prime is 12721691539. The reversal of 12721691527 is 72519612721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12721691527 - 2³¹ = 10574207879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12721691597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6360845763 + 6360845764.

It is an arithmetic number, because the mean of its divisors is an integer number (6360845764).

Almost surely, 2^12721691527 is an apocalyptic number.

12721691527 is a deficient number, since it is larger than the sum of its proper divisors (1).

12721691527 is an equidigital number, since it uses as much as digits as its factorization.

12721691527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 43.

The spelling of 12721691527 in words is "twelve billion, seven hundred twenty-one million, six hundred ninety-one thousand, five hundred twenty-seven".