1121212012091 has 2 divisors, whose sum is σ = 1121212012092. Its totient is φ = 1121212012090.

The previous prime is 1121212012079. The next prime is 1121212012159. The reversal of 1121212012091 is 1902102121211.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1121212012091 - 2¹⁰ = 1121212011067 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121218012091) 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, 560606006045 + 560606006046.

It is an arithmetic number, because the mean of its divisors is an integer number (560606006046).

Almost surely, 2^{1121212012091} is an apocalyptic number.

1121212012091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121212012091 is an equidigital number, since it uses as much as digits as its factorization.

1121212012091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 23.

It can be divided in two parts, 112121 and 2012091, that added together give a palindrome (2124212).

The spelling of 1121212012091 in words is "one trillion, one hundred twenty-one billion, two hundred twelve million, twelve thousand, ninety-one".