211121101987 has 2 divisors, whose sum is σ = 211121101988. Its totient is φ = 211121101986.

The previous prime is 211121101951. The next prime is 211121102009. The reversal of 211121101987 is 789101121112.

It is a happy number.

211121101987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211121101987 - 2¹¹ = 211121099939 is a prime.

It is not a weakly prime, because it can be changed into another prime (211121101907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560550993 + 105560550994.

It is an arithmetic number, because the mean of its divisors is an integer number (105560550994).

Almost surely, 2^211121101987 is an apocalyptic number.

211121101987 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121101987 is an equidigital number, since it uses as much as digits as its factorization.

211121101987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 34.

The spelling of 211121101987 in words is "two hundred eleven billion, one hundred twenty-one million, one hundred one thousand, nine hundred eighty-seven".