11222121121212 has 144 divisors (see below), whose sum is σ = 29292673606560. Its totient is φ = 3331787157504.

The previous prime is 11222121121207. The next prime is 11222121121261. The reversal of 11222121121212 is 21212112122211.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 68923114 + ... + 69085742.

It is an arithmetic number, because the mean of its divisors is an integer number (203421344490).

Almost surely, 2^{11222121121212} is an apocalyptic number.

11222121121212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11222121121212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14646336803280).

11222121121212 is an abundant number, since it is smaller than the sum of its proper divisors (18070552485348).

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

11222121121212 is a wasteful number, since it uses less digits than its factorization.

11222121121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163628 (or 163607 counting only the distinct ones).

The product of its digits is 128, while the sum is 21.

Adding to 11222121121212 its reverse (21212112122211), we get a palindrome (32434233243423).

The spelling of 11222121121212 in words is "eleven trillion, two hundred twenty-two billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred twelve".