211420213447 has 2 divisors, whose sum is σ = 211420213448. Its totient is φ = 211420213446.

The previous prime is 211420213399. The next prime is 211420213489. The reversal of 211420213447 is 744312024112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211420213447 - 2¹¹ = 211420211399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211420223447) 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, 105710106723 + 105710106724.

It is an arithmetic number, because the mean of its divisors is an integer number (105710106724).

Almost surely, 2^211420213447 is an apocalyptic number.

211420213447 is a deficient number, since it is larger than the sum of its proper divisors (1).

211420213447 is an equidigital number, since it uses as much as digits as its factorization.

211420213447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 31.

Adding to 211420213447 its reverse (744312024112), we get a palindrome (955732237559).

The spelling of 211420213447 in words is "two hundred eleven billion, four hundred twenty million, two hundred thirteen thousand, four hundred forty-seven".