11211112205 has 4 divisors (see below), whose sum is σ = 13453334652. Its totient is φ = 8968889760.

The previous prime is 11211112183. The next prime is 11211112223. The reversal of 11211112205 is 50221111211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50221111211 = 5479 ⋅9166109.

It can be written as a sum of positive squares in 2 ways, for example, as 2898960964 + 8312151241 = 53842^2 + 91171^2 .

It is not a de Polignac number, because 11211112205 - 2¹⁴ = 11211095821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1121111216 + ... + 1121111225.

It is an arithmetic number, because the mean of its divisors is an integer number (3363333663).

Almost surely, 2^11211112205 is an apocalyptic number.

It is an amenable number.

11211112205 is a deficient number, since it is larger than the sum of its proper divisors (2242222447).

11211112205 is an equidigital number, since it uses as much as digits as its factorization.

11211112205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2242222446.

The product of its (nonzero) digits is 40, while the sum is 17.

Adding to 11211112205 its reverse (50221111211), we get a palindrome (61432223416).

The spelling of 11211112205 in words is "eleven billion, two hundred eleven million, one hundred twelve thousand, two hundred five".