11220123211 has 12 divisors (see below), whose sum is σ = 12401024272. Its totient is φ = 10143738000.

The previous prime is 11220123169. The next prime is 11220123217. The reversal of 11220123211 is 11232102211.

It is not a de Polignac number, because 11220123211 - 2⁹ = 11220122699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11220123217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 234255 + ... + 278056.

Almost surely, 2^11220123211 is an apocalyptic number.

11220123211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11220123211 is a deficient number, since it is larger than the sum of its proper divisors (1180901061).

11220123211 is a wasteful number, since it uses less digits than its factorization.

11220123211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512514 (or 512503 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 11220123211 its reverse (11232102211), we get a palindrome (22452225422).

It can be divided in two parts, 11220 and 123211, that added together give a palindrome (134431).

The spelling of 11220123211 in words is "eleven billion, two hundred twenty million, one hundred twenty-three thousand, two hundred eleven".