211199887894493 has 2 divisors, whose sum is σ = 211199887894494. Its totient is φ = 211199887894492.

The previous prime is 211199887894403. The next prime is 211199887894511. The reversal of 211199887894493 is 394498788991112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208244438678329 + 2955449216164 = 14430677^2 + 1719142^2 .

It is a cyclic number.

It is not a de Polignac number, because 211199887894493 - 2¹⁰ = 211199887893469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211199887894403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105599943947246 + 105599943947247.

It is an arithmetic number, because the mean of its divisors is an integer number (105599943947247).

Almost surely, 2^{211199887894493} is an apocalyptic number.

It is an amenable number.

211199887894493 is a deficient number, since it is larger than the sum of its proper divisors (1).

211199887894493 is an equidigital number, since it uses as much as digits as its factorization.

211199887894493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2257403904, while the sum is 83.

The spelling of 211199887894493 in words is "two hundred eleven trillion, one hundred ninety-nine billion, eight hundred eighty-seven million, eight hundred ninety-four thousand, four hundred ninety-three".