121000020211991 has 2 divisors, whose sum is σ = 121000020211992. Its totient is φ = 121000020211990.

The previous prime is 121000020211963. The next prime is 121000020212047. The reversal of 121000020211991 is 199112020000121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121000020211991 - 2⁶ = 121000020211927 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121000020211591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60500010105995 + 60500010105996.

It is an arithmetic number, because the mean of its divisors is an integer number (60500010105996).

Almost surely, 2^{121000020211991} is an apocalyptic number.

121000020211991 is a deficient number, since it is larger than the sum of its proper divisors (1).

121000020211991 is an equidigital number, since it uses as much as digits as its factorization.

121000020211991 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 29.

The spelling of 121000020211991 in words is "one hundred twenty-one trillion, twenty million, two hundred eleven thousand, nine hundred ninety-one".