1211122203281 has 2 divisors, whose sum is σ = 1211122203282. Its totient is φ = 1211122203280.

The previous prime is 1211122203259. The next prime is 1211122203337. The reversal of 1211122203281 is 1823022211121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1183561223056 + 27560980225 = 1087916^2 + 166015^2 .

It is an emirp because it is prime and its reverse (1823022211121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211122203281 is a prime.

It is a super-2 number, since 2×1211122203281² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1211122203281.

It is not a weakly prime, because it can be changed into another prime (1211122203211) 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, 605561101640 + 605561101641.

It is an arithmetic number, because the mean of its divisors is an integer number (605561101641).

Almost surely, 2^{1211122203281} is an apocalyptic number.

It is an amenable number.

1211122203281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211122203281 is an equidigital number, since it uses as much as digits as its factorization.

1211122203281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 26.

The spelling of 1211122203281 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, two hundred three thousand, two hundred eighty-one".