11122123221 has 24 divisors (see below), whose sum is σ = 17577827904. Its totient is φ = 6720658560.

The previous prime is 11122123211. The next prime is 11122123223. The reversal of 11122123221 is 12232122111.

It is not a de Polignac number, because 11122123221 - 2⁵ = 11122123189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11122123194 and 11122123203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11122123223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133321 + ... + 200046.

It is an arithmetic number, because the mean of its divisors is an integer number (732409496).

Almost surely, 2^11122123221 is an apocalyptic number.

11122123221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11122123221 is a deficient number, since it is larger than the sum of its proper divisors (6455704683).

11122123221 is a wasteful number, since it uses less digits than its factorization.

11122123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333721 (or 333718 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 11122123221 its reverse (12232122111), we get a palindrome (23354245332).

The spelling of 11122123221 in words is "eleven billion, one hundred twenty-two million, one hundred twenty-three thousand, two hundred twenty-one".