11231211111220 has 96 divisors (see below), whose sum is σ = 24514213248000. Its totient is φ = 4317603763200.

The previous prime is 11231211111191. The next prime is 11231211111221. The reversal of 11231211111220 is 2211111213211.

It is a super-2 number, since 2×11231211111220² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11231211111221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 992063160 + ... + 992074480.

It is an arithmetic number, because the mean of its divisors is an integer number (255356388000).

Almost surely, 2^{11231211111220} is an apocalyptic number.

11231211111220 is a gapful number since it is divisible by the number (10) 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 11231211111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12257106624000).

11231211111220 is an abundant number, since it is smaller than the sum of its proper divisors (13283002136780).

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

11231211111220 is a wasteful number, since it uses less digits than its factorization.

11231211111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22249 (or 22247 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 11231211111220 its reverse (2211111213211), we get a palindrome (13442322324431).

The spelling of 11231211111220 in words is "eleven trillion, two hundred thirty-one billion, two hundred eleven million, one hundred eleven thousand, two hundred twenty".