1122112211981 has 2 divisors, whose sum is σ = 1122112211982. Its totient is φ = 1122112211980.

The previous prime is 1122112211963. The next prime is 1122112212043. The reversal of 1122112211981 is 1891122112211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 914062196356 + 208050015625 = 956066^2 + 456125^2 .

It is a cyclic number.

It is not a de Polignac number, because 1122112211981 - 2¹⁰ = 1122112210957 is a prime.

It is a super-2 number, since 2×1122112211981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1122112210981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561056105990 + 561056105991.

It is an arithmetic number, because the mean of its divisors is an integer number (561056105991).

Almost surely, 2^{1122112211981} is an apocalyptic number.

It is an amenable number.

1122112211981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1122112211981 is an equidigital number, since it uses as much as digits as its factorization.

1122112211981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 32.

The spelling of 1122112211981 in words is "one trillion, one hundred twenty-two billion, one hundred twelve million, two hundred eleven thousand, nine hundred eighty-one".