211422387521 has 2 divisors, whose sum is σ = 211422387522. Its totient is φ = 211422387520.

The previous prime is 211422387461. The next prime is 211422387529. The reversal of 211422387521 is 125783224112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150346185025 + 61076202496 = 387745^2 + 247136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211422387521 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (211422387529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105711193760 + 105711193761.

It is an arithmetic number, because the mean of its divisors is an integer number (105711193761).

Almost surely, 2^211422387521 is an apocalyptic number.

It is an amenable number.

211422387521 is a deficient number, since it is larger than the sum of its proper divisors (1).

211422387521 is an equidigital number, since it uses as much as digits as its factorization.

211422387521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 38.

The spelling of 211422387521 in words is "two hundred eleven billion, four hundred twenty-two million, three hundred eighty-seven thousand, five hundred twenty-one".