211805062213 has 2 divisors, whose sum is σ = 211805062214. Its totient is φ = 211805062212.

The previous prime is 211805062201. The next prime is 211805062267. The reversal of 211805062213 is 312260508112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198721591524 + 13083470689 = 445782^2 + 114383^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211805062213 is a prime.

It is a super-2 number, since 2×211805062213² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211805063213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105902531106 + 105902531107.

It is an arithmetic number, because the mean of its divisors is an integer number (105902531107).

Almost surely, 2^211805062213 is an apocalyptic number.

It is an amenable number.

211805062213 is a deficient number, since it is larger than the sum of its proper divisors (1).

211805062213 is an equidigital number, since it uses as much as digits as its factorization.

211805062213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 211805062213 in words is "two hundred eleven billion, eight hundred five million, sixty-two thousand, two hundred thirteen".