211242441391 has 2 divisors, whose sum is σ = 211242441392. Its totient is φ = 211242441390.

The previous prime is 211242441343. The next prime is 211242441419. The reversal of 211242441391 is 193144242112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211242441391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211242441491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105621220695 + 105621220696.

It is an arithmetic number, because the mean of its divisors is an integer number (105621220696).

Almost surely, 2^211242441391 is an apocalyptic number.

211242441391 is a deficient number, since it is larger than the sum of its proper divisors (1).

211242441391 is an equidigital number, since it uses as much as digits as its factorization.

211242441391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The spelling of 211242441391 in words is "two hundred eleven billion, two hundred forty-two million, four hundred forty-one thousand, three hundred ninety-one".