211205245 has 4 divisors (see below), whose sum is σ = 253446300. Its totient is φ = 168964192.

The previous prime is 211205233. The next prime is 211205257. The reversal of 211205245 is 542502112.

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

It is an interprime number because it is at equal distance from previous prime (211205233) and next prime (211205257).

It can be written as a sum of positive squares in 2 ways, for example, as 99141849 + 112063396 = 9957^2 + 10586^2 .

It is a cyclic number.

It is not a de Polignac number, because 211205245 - 2⁷ = 211205117 is a prime.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 21120520 + ... + 21120529.

It is an arithmetic number, because the mean of its divisors is an integer number (63361575).

Almost surely, 2^211205245 is an apocalyptic number.

It is an amenable number.

211205245 is a deficient number, since it is larger than the sum of its proper divisors (42241055).

211205245 is an equidigital number, since it uses as much as digits as its factorization.

211205245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42241054.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 211205245 is about 14532.9021533897. The cubic root of 211205245 is about 595.5271509293.

Adding to 211205245 its reverse (542502112), we get a palindrome (753707357).

The spelling of 211205245 in words is "two hundred eleven million, two hundred five thousand, two hundred forty-five".