121011022011991 has 2 divisors, whose sum is σ = 121011022011992. Its totient is φ = 121011022011990.

The previous prime is 121011022011977. The next prime is 121011022012031. The reversal of 121011022011991 is 199110220110121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121011022011991 - 2²¹ = 121011019914839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121011022011931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60505511005995 + 60505511005996.

It is an arithmetic number, because the mean of its divisors is an integer number (60505511005996).

Almost surely, 2^{121011022011991} is an apocalyptic number.

121011022011991 is a deficient number, since it is larger than the sum of its proper divisors (1).

121011022011991 is an equidigital number, since it uses as much as digits as its factorization.

121011022011991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 31.

The spelling of 121011022011991 in words is "one hundred twenty-one trillion, eleven billion, twenty-two million, eleven thousand, nine hundred ninety-one".