211121200099991 has 2 divisors, whose sum is σ = 211121200099992. Its totient is φ = 211121200099990.

The previous prime is 211121200099987. The next prime is 211121200100003. The reversal of 211121200099991 is 199990002121112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211121200099991 - 2² = 211121200099987 is a prime.

It is a super-2 number, since 2×211121200099991² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211121200099951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560600049995 + 105560600049996.

It is an arithmetic number, because the mean of its divisors is an integer number (105560600049996).

Almost surely, 2^{211121200099991} is an apocalyptic number.

211121200099991 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121200099991 is an equidigital number, since it uses as much as digits as its factorization.

211121200099991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 47.

The spelling of 211121200099991 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred million, ninety-nine thousand, nine hundred ninety-one".