1123212023281 has 2 divisors, whose sum is σ = 1123212023282. Its totient is φ = 1123212023280.

The previous prime is 1123212023267. The next prime is 1123212023317. The reversal of 1123212023281 is 1823202123211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 660832423056 + 462379600225 = 812916^2 + 679985^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123212023281 - 2¹³ = 1123212015089 is a prime.

It is a super-2 number, since 2×1123212023281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1123212023261) 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, 561606011640 + 561606011641.

It is an arithmetic number, because the mean of its divisors is an integer number (561606011641).

Almost surely, 2^{1123212023281} is an apocalyptic number.

It is an amenable number.

1123212023281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123212023281 is an equidigital number, since it uses as much as digits as its factorization.

1123212023281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

Adding to 1123212023281 its reverse (1823202123211), we get a palindrome (2946414146492).

The spelling of 1123212023281 in words is "one trillion, one hundred twenty-three billion, two hundred twelve million, twenty-three thousand, two hundred eighty-one".