11111221122 has 32 divisors (see below), whose sum is σ = 22614621120. Its totient is φ = 3638871360.

The previous prime is 11111221103. The next prime is 11111221123. The reversal of 11111221122 is 22112211111.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (11111221123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28504 + ... + 151772.

It is an arithmetic number, because the mean of its divisors is an integer number (706706910).

Almost surely, 2^11111221122 is an apocalyptic number.

11111221122 is an abundant number, since it is smaller than the sum of its proper divisors (11503399998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11111221122 is a wasteful number, since it uses less digits than its factorization.

11111221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123538.

The product of its digits is 16, while the sum is 15.

Adding to 11111221122 its reverse (22112211111), we get a palindrome (33223432233).

It can be divided in two parts, 11111 and 221122, that multiplied together give a palindrome (2456886542).

The spelling of 11111221122 in words is "eleven billion, one hundred eleven million, two hundred twenty-one thousand, one hundred twenty-two".