12138332281 has 2 divisors, whose sum is σ = 12138332282. Its totient is φ = 12138332280.

The previous prime is 12138332279. The next prime is 12138332287. The reversal of 12138332281 is 18223383121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12136327225 + 2005056 = 110165^2 + 1416^2 .

It is a cyclic number.

It is not a de Polignac number, because 12138332281 - 2¹ = 12138332279 is a prime.

It is a super-2 number, since 2×12138332281² (a number of 21 digits) contains 22 as substring.

Together with 12138332279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12138332287) 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, 6069166140 + 6069166141.

It is an arithmetic number, because the mean of its divisors is an integer number (6069166141).

Almost surely, 2^12138332281 is an apocalyptic number.

It is an amenable number.

12138332281 is a deficient number, since it is larger than the sum of its proper divisors (1).

12138332281 is an equidigital number, since it uses as much as digits as its factorization.

12138332281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 34.

It can be divided in two parts, 121383 and 32281, that added together give a square (153664 = 392²).

The spelling of 12138332281 in words is "twelve billion, one hundred thirty-eight million, three hundred thirty-two thousand, two hundred eighty-one".