211001209987 has 2 divisors, whose sum is σ = 211001209988. Its totient is φ = 211001209986.

The previous prime is 211001209981. The next prime is 211001210027. The reversal of 211001209987 is 789902100112.

It is an a-pointer prime, because the next prime (211001210027) can be obtained adding 211001209987 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211001209987 - 2¹¹ = 211001207939 is a prime.

It is not a weakly prime, because it can be changed into another prime (211001209981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105500604993 + 105500604994.

It is an arithmetic number, because the mean of its divisors is an integer number (105500604994).

Almost surely, 2^211001209987 is an apocalyptic number.

211001209987 is a deficient number, since it is larger than the sum of its proper divisors (1).

211001209987 is an equidigital number, since it uses as much as digits as its factorization.

211001209987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 40.

The spelling of 211001209987 in words is "two hundred eleven billion, one million, two hundred nine thousand, nine hundred eighty-seven".