1111121020109 has 2 divisors, whose sum is σ = 1111121020110. Its totient is φ = 1111121020108.

The previous prime is 1111121020103. The next prime is 1111121020159. The reversal of 1111121020109 is 9010201211111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1107592066084 + 3528954025 = 1052422^2 + 59405^2 .

It is an emirp because it is prime and its reverse (9010201211111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1111121020109 - 2¹² = 1111121016013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111121020103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555560510054 + 555560510055.

It is an arithmetic number, because the mean of its divisors is an integer number (555560510055).

Almost surely, 2^{1111121020109} is an apocalyptic number.

It is an amenable number.

1111121020109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111121020109 is an equidigital number, since it uses as much as digits as its factorization.

1111121020109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 20.

The spelling of 1111121020109 in words is "one trillion, one hundred eleven billion, one hundred twenty-one million, twenty thousand, one hundred nine".