211211211120989 has 2 divisors, whose sum is σ = 211211211120990. Its totient is φ = 211211211120988.

The previous prime is 211211211120983. The next prime is 211211211121037. The reversal of 211211211120989 is 989021112112112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208460406432964 + 2750804688025 = 14438158^2 + 1658555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211211211120989 is a prime.

It is a super-2 number, since 2×211211211120989² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211211211120983) 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, 105605605560494 + 105605605560495.

It is an arithmetic number, because the mean of its divisors is an integer number (105605605560495).

Almost surely, 2^{211211211120989} is an apocalyptic number.

It is an amenable number.

211211211120989 is a deficient number, since it is larger than the sum of its proper divisors (1).

211211211120989 is an equidigital number, since it uses as much as digits as its factorization.

211211211120989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 41.

The spelling of 211211211120989 in words is "two hundred eleven trillion, two hundred eleven billion, two hundred eleven million, one hundred twenty thousand, nine hundred eighty-nine".