211821549660089 has 2 divisors, whose sum is σ = 211821549660090. Its totient is φ = 211821549660088.

The previous prime is 211821549659987. The next prime is 211821549660107. The reversal of 211821549660089 is 980066945128112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125098744410025 + 86722805250064 = 11184755^2 + 9312508^2 .

It is a cyclic number.

It is not a de Polignac number, because 211821549660089 - 2²⁰ = 211821548611513 is a prime.

It is not a weakly prime, because it can be changed into another prime (211821539660089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105910774830044 + 105910774830045.

It is an arithmetic number, because the mean of its divisors is an integer number (105910774830045).

Almost surely, 2^{211821549660089} is an apocalyptic number.

It is an amenable number.

211821549660089 is a deficient number, since it is larger than the sum of its proper divisors (1).

211821549660089 is an equidigital number, since it uses as much as digits as its factorization.

211821549660089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14929920, while the sum is 62.

The spelling of 211821549660089 in words is "two hundred eleven trillion, eight hundred twenty-one billion, five hundred forty-nine million, six hundred sixty thousand, eighty-nine".