1121212111109 has 2 divisors, whose sum is σ = 1121212111110. Its totient is φ = 1121212111108.

The previous prime is 1121212111093. The next prime is 1121212111153. The reversal of 1121212111109 is 9011112121211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1000510065025 + 120702046084 = 1000255^2 + 347422^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121212111109 - 2⁴ = 1121212111093 is a prime.

It is a super-2 number, since 2×1121212111109² (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 (1121212119109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560606055554 + 560606055555.

It is an arithmetic number, because the mean of its divisors is an integer number (560606055555).

Almost surely, 2^{1121212111109} is an apocalyptic number.

It is an amenable number.

1121212111109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121212111109 is an equidigital number, since it uses as much as digits as its factorization.

1121212111109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 23.

It can be divided in two parts, 1121212 and 111109, that added together give a palindrome (1232321).

The spelling of 1121212111109 in words is "one trillion, one hundred twenty-one billion, two hundred twelve million, one hundred eleven thousand, one hundred nine".