12200121009991 has 2 divisors, whose sum is σ = 12200121009992. Its totient is φ = 12200121009990.

The previous prime is 12200121009977. The next prime is 12200121010067. The reversal of 12200121009991 is 19990012100221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12200121009991 - 2⁷ = 12200121009863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12200121009991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12200121009191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6100060504995 + 6100060504996.

It is an arithmetic number, because the mean of its divisors is an integer number (6100060504996).

Almost surely, 2^{12200121009991} is an apocalyptic number.

12200121009991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12200121009991 is an equidigital number, since it uses as much as digits as its factorization.

12200121009991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 37.

The spelling of 12200121009991 in words is "twelve trillion, two hundred billion, one hundred twenty-one million, nine thousand, nine hundred ninety-one".