12721256357 has 2 divisors, whose sum is σ = 12721256358. Its totient is φ = 12721256356.

The previous prime is 12721256351. The next prime is 12721256393. The reversal of 12721256357 is 75365212721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6980769601 + 5740486756 = 83551^2 + 75766^2 .

It is a cyclic number.

It is not a de Polignac number, because 12721256357 - 2⁶ = 12721256293 is a prime.

It is a super-2 number, since 2×12721256357² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12721256351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6360628178 + 6360628179.

It is an arithmetic number, because the mean of its divisors is an integer number (6360628179).

Almost surely, 2^12721256357 is an apocalyptic number.

It is an amenable number.

12721256357 is a deficient number, since it is larger than the sum of its proper divisors (1).

12721256357 is an equidigital number, since it uses as much as digits as its factorization.

12721256357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 176400, while the sum is 41.

The spelling of 12721256357 in words is "twelve billion, seven hundred twenty-one million, two hundred fifty-six thousand, three hundred fifty-seven".