2211123505 has 4 divisors (see below), whose sum is σ = 2653348212. Its totient is φ = 1768898800.

The previous prime is 2211123491. The next prime is 2211123517. The reversal of 2211123505 is 5053211122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5053211122 = 2 ⋅2526605561.

It can be written as a sum of positive squares in 2 ways, for example, as 1393678224 + 817445281 = 37332^2 + 28591^2 .

It is not a de Polignac number, because 2211123505 - 2⁹ = 2211122993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 221112346 + ... + 221112355.

It is an arithmetic number, because the mean of its divisors is an integer number (663337053).

Almost surely, 2^2211123505 is an apocalyptic number.

It is an amenable number.

2211123505 is a deficient number, since it is larger than the sum of its proper divisors (442224707).

2211123505 is an equidigital number, since it uses as much as digits as its factorization.

2211123505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442224706.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 2211123505 is about 47022.5850522916. The cubic root of 2211123505 is about 1302.7797530798.

Adding to 2211123505 its reverse (5053211122), we get a palindrome (7264334627).

The spelling of 2211123505 in words is "two billion, two hundred eleven million, one hundred twenty-three thousand, five hundred five".