1212011121091 has 2 divisors, whose sum is σ = 1212011121092. Its totient is φ = 1212011121090.

The previous prime is 1212011121071. The next prime is 1212011121103. The reversal of 1212011121091 is 1901211102121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1212011121091 - 2²³ = 1212002732483 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212011121001) 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, 606005560545 + 606005560546.

It is an arithmetic number, because the mean of its divisors is an integer number (606005560546).

Almost surely, 2^{1212011121091} is an apocalyptic number.

1212011121091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212011121091 is an equidigital number, since it uses as much as digits as its factorization.

1212011121091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 1212011121091 in words is "one trillion, two hundred twelve billion, eleven million, one hundred twenty-one thousand, ninety-one".