211523404447 has 2 divisors, whose sum is σ = 211523404448. Its totient is φ = 211523404446.

The previous prime is 211523404441. The next prime is 211523404489. The reversal of 211523404447 is 744404325112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211523404447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211523404441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105761702223 + 105761702224.

It is an arithmetic number, because the mean of its divisors is an integer number (105761702224).

Almost surely, 2^211523404447 is an apocalyptic number.

211523404447 is a deficient number, since it is larger than the sum of its proper divisors (1).

211523404447 is an equidigital number, since it uses as much as digits as its factorization.

211523404447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 107520, while the sum is 37.

Adding to 211523404447 its reverse (744404325112), we get a palindrome (955927729559).

The spelling of 211523404447 in words is "two hundred eleven billion, five hundred twenty-three million, four hundred four thousand, four hundred forty-seven".