205428217017211 has 4 divisors (see below), whose sum is σ = 205428877659000. Its totient is φ = 205427556375424.

The previous prime is 205428217017209. The next prime is 205428217017277. The reversal of 205428217017211 is 112710712824502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205428217017211 - 2¹ = 205428217017209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205428217017311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329854246 + ... + 330476443.

It is an arithmetic number, because the mean of its divisors is an integer number (51357219414750).

Almost surely, 2^{205428217017211} is an apocalyptic number.

205428217017211 is a deficient number, since it is larger than the sum of its proper divisors (660641789).

205428217017211 is an equidigital number, since it uses as much as digits as its factorization.

205428217017211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660641788.

The product of its (nonzero) digits is 125440, while the sum is 43.

The spelling of 205428217017211 in words is "two hundred five trillion, four hundred twenty-eight billion, two hundred seventeen million, seventeen thousand, two hundred eleven".