11112212281 has 2 divisors, whose sum is σ = 11112212282. Its totient is φ = 11112212280.

The previous prime is 11112212273. The next prime is 11112212297. The reversal of 11112212281 is 18221221111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10016006400 + 1096205881 = 100080^2 + 33109^2 .

It is a cyclic number.

It is not a de Polignac number, because 11112212281 - 2³ = 11112212273 is a prime.

It is a super-2 number, since 2×11112212281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11112212381) 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, 5556106140 + 5556106141.

It is an arithmetic number, because the mean of its divisors is an integer number (5556106141).

Almost surely, 2^11112212281 is an apocalyptic number.

It is an amenable number.

11112212281 is a deficient number, since it is larger than the sum of its proper divisors (1).

11112212281 is an equidigital number, since it uses as much as digits as its factorization.

11112212281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128, while the sum is 22.

Adding to 11112212281 its reverse (18221221111), we get a palindrome (29333433392).

The spelling of 11112212281 in words is "eleven billion, one hundred twelve million, two hundred twelve thousand, two hundred eighty-one".