11211011011205 has 4 divisors (see below), whose sum is σ = 13453213213452. Its totient is φ = 8968808808960.

The previous prime is 11211011011199. The next prime is 11211011011219. The reversal of 11211011011205 is 50211011011211.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1982551296961 + 9228459714244 = 1408031^2 + 3037838^2 .

It is not a de Polignac number, because 11211011011205 - 2⁸ = 11211011010949 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, 1121101101116 + ... + 1121101101125.

It is an arithmetic number, because the mean of its divisors is an integer number (3363303303363).

Almost surely, 2^{11211011011205} is an apocalyptic number.

It is an amenable number.

11211011011205 is a deficient number, since it is larger than the sum of its proper divisors (2242202202247).

11211011011205 is an equidigital number, since it uses as much as digits as its factorization.

11211011011205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242202202246.

The product of its (nonzero) digits is 20, while the sum is 17.

Adding to 11211011011205 its reverse (50211011011211), we get a palindrome (61422022022416).

The spelling of 11211011011205 in words is "eleven trillion, two hundred eleven billion, eleven million, eleven thousand, two hundred five".