12121111020091 has 2 divisors, whose sum is σ = 12121111020092. Its totient is φ = 12121111020090.

The previous prime is 12121111020071. The next prime is 12121111020113. The reversal of 12121111020091 is 19002011112121.

It is a happy number.

It is an a-pointer prime, because the next prime (12121111020113) can be obtained adding 12121111020091 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12121111020091 - 2⁹ = 12121111019579 is a prime.

It is a super-2 number, since 2×12121111020091² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12121111020071) 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, 6060555510045 + 6060555510046.

It is an arithmetic number, because the mean of its divisors is an integer number (6060555510046).

Almost surely, 2^{12121111020091} is an apocalyptic number.

12121111020091 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121111020091 is an equidigital number, since it uses as much as digits as its factorization.

12121111020091 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 12121111020091 in words is "twelve trillion, one hundred twenty-one billion, one hundred eleven million, twenty thousand, ninety-one".