12355521281 has 2 divisors, whose sum is σ = 12355521282. Its totient is φ = 12355521280.

The previous prime is 12355521197. The next prime is 12355521313. The reversal of 12355521281 is 18212555321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10835769025 + 1519752256 = 104095^2 + 38984^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12355521281 is a prime.

It is a super-2 number, since 2×12355521281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12355529281) 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, 6177760640 + 6177760641.

It is an arithmetic number, because the mean of its divisors is an integer number (6177760641).

Almost surely, 2^12355521281 is an apocalyptic number.

It is an amenable number.

12355521281 is a deficient number, since it is larger than the sum of its proper divisors (1).

12355521281 is an equidigital number, since it uses as much as digits as its factorization.

12355521281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24000, while the sum is 35.

The spelling of 12355521281 in words is "twelve billion, three hundred fifty-five million, five hundred twenty-one thousand, two hundred eighty-one".