1121021099981 has 2 divisors, whose sum is σ = 1121021099982. Its totient is φ = 1121021099980.

The previous prime is 1121021099969. The next prime is 1121021100019. The reversal of 1121021099981 is 1899901201211.

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., 807347175625 + 313673924356 = 898525^2 + 560066^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121021099981 - 2⁶ = 1121021099917 is a prime.

It is a super-2 number, since 2×1121021099981² (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 (1121021099921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560510549990 + 560510549991.

It is an arithmetic number, because the mean of its divisors is an integer number (560510549991).

Almost surely, 2^{1121021099981} is an apocalyptic number.

It is an amenable number.

1121021099981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121021099981 is an equidigital number, since it uses as much as digits as its factorization.

1121021099981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 44.

The spelling of 1121021099981 in words is "one trillion, one hundred twenty-one billion, twenty-one million, ninety-nine thousand, nine hundred eighty-one".